1FTR  - One For The Road
AAMOF  - As A Matter Of Fact
AAMOI  - As A Matter Of Interest
Abbr.  - Abbreviation
ACK  - Acknowledgement
ADN  - Any Day Now 
AFAIAA  - As Far As I Am Aware
AFAIAC  - As Far As I Am Concerned
AFAICT  - As Far As I Can Tell
AFAIK  - As Far As I Know
AFAIR  - As Far As I Remember/Recall
AFAIU  - As Far As I Understand
AFAIUI  - As Far As I Understand It
AFDN  - Any Fucking Day Now
AFK  - Away From The Keyboard; Away For A Kwickie
AFL  - AbsoFreakinLutely
AFU  - All F*ucked Up
AI  - Artificial Intelligence
AISB  - As I Said Before; As It Should Be
AISBYSJ  - As I Said Before You Stupid Jackass
AISE  - As I Said Earlier
AISI  - As I See It
AIUI - As I Understand It
AIW - As It Were/Was
AKA - Also Known As
AMAP  - As Much/Many As Possible
AMF  - Adios My Friend; Adios Mother Fucker
ANFAWFOS  - And Now For A Word From Our Sponsor
ANSI  - American National Standards Institute
ANY1  - Anyone
AOB  - Any Other Business
AOBTD  - Another One Bites The Dust
AOL  - America On Line – Assholes On Line
APAC  - All Praise And Credit
API  - Application Program Interface
ARPA  - Advanced Research Projects Agency
AS  - Age/ Sex?
A/S  - Age/ Sex?
A/S?  - Age/ Sex?
ASAFP  - As Soon As Fucking Possible
ASAP  - As Soon As Possible
ASCII  - American Standard Code for Information Interchange
ASL  - Age/ Sex/ Location?
A/S/L  - Age/Sex/Location?
A/S/L?  - Age/ Sex/ Location?
ATB  - All The Best
ATK  - At The Keyboard
ATM  - At The Moment
ATTN  - Attention
ATTYOB  - Anything That Turns You On Baby
AU  - Australia
aVG  - Average
AWCIGO - And Where Can I Get One
AWGTHTGTATA  - Are We Going To Have To Go Through All This/That Again
AWGTHTGTTA  - Are We Going To Have To Go Through This/ That Again
AWHFY  - Are We Having Fun Yet
AYT  - Are You There

B

B4  - Before
B4N  - Bye For Now
BAC  - By Any Chance
BAD  - Broken As Designed
BAK  - Back At Keyboard
BAK4  - Two Clear Points of View ??
BAMBI  - Bad Assed Motherfucker Bit It
BAMF  - Bad Asrsed Mother Fucker
BBB  - Busy Beyond Belief
BBFN  - Bye Bye For Now
BBIAB  - Be Back In A Bit
BBIAF  - Be Back In A Flash
BBIAM  - Be Back In A Minute
BBIAS  - Be Back In A Sec
BBL  - Be Back Later
BBN  - Bye Bye Now
BBR  - Burnt Beyond Repair
BBS  - Bulletin Board System
BC  - Basket Case; Because
B/C  - Because
BCC  - Blind Carbon Copy
BCNU  - Be Seein' You
BEG  - Big Evil Grin
BF  - Boy Friend
BFD  - Big Fucking Deal
BFG  - Big Friendly Giant; Big Fucking Gun
BFH  - Bastard From Hell
BFI  - Brute Force and Ignorance; Bunch of Fucking Idiots
BFMI - Brute Force and Massive Ignorance
BFN  - Bye For Now
BG - Big Grin
BGP - bend them over, grease them up, and prong them 
BIC  - Best In Class
BIL  - Brother In Law
BION  - Believe It Or Not
BIOYA  - Blow It Out Your Ass
BITD  - Beaten It To Death
BK  - Because
BM  - Blonde Moment
B&M  - Brick & Mortar 
BMF - Bad Mother Fucker
BMHATK  - Banging My Head Against The Keyboard
BMHATW  - Banging My Head Against The Wall
BMTA  - Brilliant Minds Think Alike
BMTIPG  - Brilliant Minds Think In Parallel Gutters
BNF  - Big Name Fan
BOC  - But Of Course
BOF  - Birds Of a Feather
BOHICA  - Bend Over Here It Comes Again
BOHOF  - Back Of Hand On Forehead
BOL  - Best Of Luck
BOS  - Boyfriend Over Shoulder
BOT  - Back On Topic
BOTEC  - Back Of The Envelope Calculation
BRB  - Be Right Back
BRBGP  - Be Right Back Gotta Pee
BRBIGP  - Be Right Back I Gotta Pee
BRO  - Brother
Bros.  - Brothers
BRS  - Big Red Switch
BRT  - Be Right There
BS  - Bullshit. 
BSEG  - Big Shit Eating Grin
BSG  - Big Smiling Grin; Broad Sweeping Generalisation
BSOD  - Blue Screen Of Death
BTA  - But Then Again
BTAICBW  - But Then Again I Could Be Wrong
BTAIM  - Be That As It May
BTDT  - Been There Done That
BTDTGTTS  - Been There Done That Got The T-Shirt
BTG  - Buck Tooth Green
BTOBD  - Be There Or Be Dead
BTOBS  - Be There Or Be Square
BTSOOM  - Beats The Shit Out Of Me
BTTP  - Back To The Point
BTW  - By The Way
BWL  - Bursting With Laughter
BWQ  - Buzz Word Quotient
BY  - BusY
BYKT  - But You Know/Knew That
BYKTA  - But You Know/Knew That Already
BYOB  - Bring Your Own Bottle/Booze
BYOC  - Bring your own condom 

C 

C  - See
CADET  - Can't Add Doesn't Even Try
CB  - Call Back
CC  - Carbon Copy
CCWC  - Can't Cook Won't Cook
CE  - Creative Editing
CERT  - Computer Emergency Response Team
CFD  - Call For Discussion
CFV  - Call For Votes
CG  - Cute Grin
CGI  - Common Gateway Interface
CHOWUR  - See HOW yoU aRe
CHUR  - See How yoU aRe
CIAC  - Computer Incident Advisory Capability
CIAO  - goodbye [pronounced Chow]
CIC  - Christ I'm Confused
CICO  - Coffee In Coffee Out
CID  - Crying In Disgrace
CIO  - Cut It Out
Cir.  - Circle
CLAB  - Crying Like A Baby
CLM  - Career Limiting Move
CMIIW  - Correct Me If I'm Wrong
CNP  - Continued Next Post
CO  - COnference
C/O  - Care Of
COD  - Cash On Delivery
COTFLGUOAHAHA  - Crawling On The Floor Laughing Guts Out And Having A Heart Attack
COTN  - Coffee/Coke Out The Nose
CP  - Chat Post
C&P  - Copy & Paste
CPF  - Can Pigs Fly
CRAFT  - Can't Remember A Fucking Thing
CRC  - Cyclic Redundancy Check
CRS  - Can't Remember Shit
CS  - Cop Shop
CSG  - Chuckle Snicker Grin
CST  - Central Standard Time [US time zone]
CTR  - Choose The Right
CTTD  - Cute Things They Do
CTTS  - Cute Things They Say
CU  - See yoU
CUL  - See yoU Later
CUL8R  - See yoU LateR
CUNT  - can't understand normal talk 
CV  - Curriculum Vitae
CWYL  - Chat With You Later
CYA  - See Ya; Cover Your Ass
CYL  - See You Later

 D

DAP  - Parents Against Dyslexia [chuckle]
DARFC  - Ducking And Running For Cover
DBA  - Doing Business As
DBN  - Doing Business - Not
DEG  - Deliciously Evil Grin
DFM  - Don't Flame Me
DH  - Dear/Damn Husband
DICA  - Do I Care Asshole
DIFA  - Dumb Intellectual Fat Ass
DIIK  - Damned If I Know
DIIN  - Damned If I kNow
DILLIGAF  - Does It Look Like I Give A Fuck 
DILLIGAFF  - Does It Look Like I Give A Flying Fuck
DIM  - Do It Myself
DIY  - Do It Yourself
DK  - Don't Know
DL  - DownLoad
D/L  - Download
DLG  - Devilish Little Grin
DLTBBB  - Don't Let The Bed Bugs Bite
DNA  - Did Not Answer
DNO  - Do Not Open 
DNPM  - Darn Near Pissed Myself
DNPML  - Darn Near Pissed Myself Laughing
DNS  - Domain Name System
DOA  - Dead On Arrival
DOB  - Date Of Birth
DOMOTY  - Dirty Old Man Of The Year
DOS  - Disk Operating System 
DPKOL  - Deep Passionate Kiss On the Lips
Dr  - Doctor
DRT  - DEAD RIGHT THERE 
DTOKAB  - Drop To One Knee And Bow/Blow
DTP  - DeskTop Publishing
DTRT  - Do The Right Thing
DTTAH  - Don't Try This At Home
DUCWIC  - Do YoU See What I See
DUK  - Dead Upon Keyboard
D&W  - Ducking And Weaving
DWIM  - Do What I Mean
DWIMC  - Do What I Mean Correctly
DWIMNWIS  - Do What I Mean Not What I Say
DWISNWID  - Do What I Say Not What I Do
DWPKOL  - Deep Wet Passionate Kiss On the Lips
DYE  - Damn Your Eyes
DYHWIH  - Do You Hear What I Hear
DYSWIS  - Do You See What I See

E 

E2EG  - Ear to Ear Grin
ED  - Emotionally Disturbed
EDP  - Emotionally Disturbed Person
EDT  - Eastern Daylight savings Time [US time zone]
EG  - Evil Grin
EIF  - Exercise In Futility
ELOL  - Evil Laughing Out Loud
EMSG  - Email Message
EOB  - End Of Business
EOD - End Of Discussion
E&OE  - Errors And Omissions Excepted; Errors And Omissions Expected
EOF - End Of File
EOL  - End Of Lecture
EOF  - End Of Message (nearly always seen in lower case)
EOT - End Of Thread
EPID - Every Person Is Different
ESAD - Eat Shit And Die
ESAL - Eat Shit And Live
ES&D  - Eat Shit And Die
ESOSL - Endless Snorts Of Stupid Laughter
ESP - ESPecially
EST  - Eastern Standard Time [US time zone]
ETA  - Estimated Time Of Arrival
ETLA - Extended Three Letter Acronym

F 

F2F - Face To Face
FAQ - Frequently Asked Question(s)
FB  - Fine Business; Fat Bastard
FCFS - First Come First Served
FCOL - For Crying Out Loud
FDROTFL - Falling Down Rolling On The Floor Laughing
FFRD  - Flying Fuck in a Rolling Doughnut
FFS  - For Fuck's Sake
FFTFM - For The Feeble Minded
FICCL - Frankly I Couldn't Care Less
FIGJAM - Fuck I'm Good Just Ask Me
FIGMO  - Fuck It Got My Orders
FIIK - Fucked If I Know
FIIN  - Fucked If I kNow
FIL - Father In Law
FIOFY  - Figure It Out For Yourself
FIRST  - Forum of Incident Response and Security Teams
FISH - First In Still Here
FITB  - Fill In The Blank
FITH - Fucked In The Head
FLEA  - Four Letter Extended Acronym
FMH - Fuck Me Harder
FOAD - Fuck Off And Die
FOAF  - Friend Of A Friend
FOAFOAG  - Father Of A Friend Of A Girlfriend
FOAG - Father Of A Girlfriend
FOCL  - Fell Off Chair Laughing
FOD - Finger Of Death
FOOBAR - cf FUBAR
FOS - Freedom Of Speech; Full Of Shit
FOT - Full Of Tripe
FOTCL - Falling Off The Chair Laughing
FRED  - Fucking Ridiculous Electronic Device
FRO - Fuck Right Off
FROB - Fuck Right Off Baby
FSD - Fools Seldom Differ
FTASB - Faster Than A Speeding Bullet
FTBOMH  - From The Bottom Of My Heart
FTF - Face To Face
FTL - Faster Than Light
FTP - File Transfer Protocol
FTR - For The Record
FTS - Fixin' To Start
FUBAB - Fucked Up Beyond All Believe
FUBAR - Fucked Up Beyond All Repair/Recognition
FUD - Fear Uncertainty And Doubt
FUDA  - Fuck yUo Dumbass
FUMTU - Fucked Up More Than Usual
FURTB - Full Up Ready To Burst
FWIW - For What It's Worth
FWY - Freeway
FYA - For Your Amusement
FYATHYRIO - Fuck You And The Horse You Rode In On
FYI  - For Your Information
G - Grin 
GA  - Go Ahead
GAC - Get A Clue
GAFIA - Get Away From It All
GAL - Get A Life
GBH&K  - Great Big Hugs & Kisses
GBH&KB - Great Big Hugs & Kisses Back
GD&R - Grinning Ducking And Running
GD&RF - Grinning Ducking And Running Fast
GD&RVVF - Grinning Ducking And Running Very Very Fast
GD&W  - Grinning Ducking And Weaving
GF - GirlFriend
GFN - Gone For Now
GFR - Grim File Reaper
GFU - General Fuck Up
GFY - Go Fuck Yourself
GFYS  - Go Fuck Your Self
GG  - Gotta Go
GGN - Gotta Go Now
GGP - Gotta Go Pee
GH  - Getting Hard (male)
GIF - Graphical Interchange Format
GIGO - Garbage In Garbage Out; Garbage In Gospel Out
GIWIST - Gee I Wish I'd Said That
GJ - Good Job
GJP - Good Job Partner
GL - Good Luck
GLG - Goofy Little Grin
GLGH - Good Luck and Good Hunting
GMAO - Giggling My Ass Off
GMT  - Greenwich Mean Time [UK Time]
GMTA  - Great Minds Think Alike
GOK - God Only Knows
GOMFAB  - Get off my fucking aching back 
GOOML - Get Out Of My Life
GOS - Girlfriend Over Shoulder
GOTFIA  - Groaning On The Floor In Agony
GOWI  - Get On With It
GPF - General Protection Fault; Go Puke Fast
GR8 - Great
GRQ  - Get Rich Quick - a type of spam (MMF)
GRUIT - Get Real yoU Impudent Thing
GSH  - Good Sense of Humour
GTBOS - Glad To Be Of Service
GTFOH - Get The Fuck Outta Here
GTFOOMF - Get The Fuck Out Of My Face
GTG  - Got To Go
GTGB  - Got To Get Beer
GTGN - Got To Go Now
GTHBS - Glad to have Been Seminal
GTP - Got To Pee
GTS - God That Sucked
GTSU  - Glad/Good To See You
GW  - Getting Wet (female)
GYFFR - Get Your Fucking Facts Right

H

H2  - How To
HABO  - Have A Better One
HACB  - Horny As Can Be
HAGN  - Have A Good Night
HAGO  - Have A Good One
HAK  - Hugs And Kisses
HAND  - Have A Nice Day
HATM  - Howling At The Moon
HB  - Honey Bear; HummingBird
HCB  - Holy Cow Batman
HHB  - Hello Honey Bear
HHGTTG  - Hitch Hiker's Guide To The Galaxy
HHIS  - Hanging Head In Shame
HHO1/2K  - Ha Ha Only Half Kidding
HHOJ  - Ha Ha Only Joking
HHOK  - Ha Ha Only Kidding
HHOS  - Ha Ha Only Serious
HIB__  - Have I Been ___________
HICA  - Here It Comes Again
H&K  - Hugs & Kisses
HMFIC  - Head Mother-Fucker In Charge
HNG  - Horny Net Geek
HOAS  - Hold On A Second
HOMPR  - Hang On Mobile Phone's Ringing
HOPR  - Hang On Phone's Ringing
HOS  - Husband Over Shoulder
HOUER  - Hanging On yoUr Every Word
HOYER  - Hanging On Your Every Word
HP  - Home Page
HRU  - How Are You 
HSIK  - How Should I Know
HSP  - Highly Sensitive Person
HTFSIK  - How The Fuck Should I Know
HTH  - Hope This Helps
HTML  - HyperText Markup Language
HTTP  - HyperText Transfer Protocol
HUA  - Head Up Ass
HW  - HardWare
HWS  - Husband Wants Sex
HWUA  - Head Way Up Ass
HWY  - Highway

I 

IAAA  - I Am An Accountant
IAAD  - I Am A Doctor
IAAL  - I Am A Lawyer
IAC  - In Any Case
IAE  - In Any Event
IAGFII  - It's All Good Fun Isn't It
IANA  - Internet Assigned Numbers Authority
IANAA  - I Am Not An Accountant
IANAC  - I Am Not A Crook
IANAD  - I Am Not A Doctor
IANAL  - I Am Not A Lawyer
IANYM  - In A New York Minute
IANYS  - In A New York Second
IAP  - Internet Access Provider
IARTPFWTSIOWIM  - I Am Repeating This Parrot Fashion Without The Slightest Idea Of What It Means
IASH  - I Am So Horny
IAWC  - In A While Crocodile [usually used to reply to SYLA(cf)]
IAY  - I Adore You
IAYT  - I Adore You Too [also IAY2]
IB  - I'm Back
IBC  - Inadequate But Cute
IBM  - Inadequate But Marketable
IBTD  - I Beg To Differ
IC  - I See; In Character
ICB  - I Care Because
ICBW  - I Could Be Wrong
ICCL  - I Couldn't Care Less
ICGAFF  - I Couldn't Give A Flying Fuck
ICP  - Internet Content Provider
ICQ  - I Seek You [an Internet messaging system]
ICTYBTIHTKY  - I Could Tell You But Then I'd Have To Kill You
ICU  - I see you
ICU2  - I See You too
ICUR  - I See yoU aRe
ID  - Identification
IDGAD  - I Don't Give A Damn
IDGAF  - I Don't Give A Fuck (also seen as I Do Give A Fuck)
IDGAFF  - I Don't Give A Flying Fuck
IDGARA  - I Don't Give A Rat's Ass
IDGAS  - I Don't Give A Shit
IDGI  - I Don't Get It
IDK  - I Don't Know
IDN  - I Don't Know
iDOT  - Internet Development Outreach and Technology
IDTS  - I Don't Think So
IDTT  - I'll Drink To That
IE  - In Effect
IETF  - Internet Engineering Task Force
IGP  - I Gotta Pee
IHABICNRWTSF  - I Hate Abbreviations Because I Can Never Remember What They Stand For
IHTBS  - It Has To Be Shown
IHTFP  - I Hate This Fucking Place; I Have Truly Found Paradise
IIABDFI  - If It Ain't Broke Don't Fix It
IIRC  - If I Recall/Remember Correctly
IITYWIMWYBMAD  - If I Tell You What It Means Will You Buy Me A Drink
IITYWIMWYKM  - If I Tell You What It Means Will You Kiss Me
IITYWITIWHTKY  - If I Tell You What It Means I Will Have To Kill You
IJLS  - I Just Like Saying
IK  - I Know; Inverse Kinematics
IKWUM  - I Know What yoU Mean
IKWYM  - I Know What You Mean
ILI  - I Like Ike
ILICISCOMK  - I Laughed, I Cried, I Spilt Coffee/Coke On My Keyboard
ILIWAPCT  - I Love It When A Plan Comes Together
ILU  - I Love yoU
ILUT  - I Love yoU Too [also ILU2]
ILY  - I Love You
IMAO  - In My Arrogant Opinion
IMBO  - In My Biased Opinion
IMCDO  - In My Conceited Dogmatic Opinion
IMCO  - In My Considered Opinion
IME  - In My Experience
IMHO  - In My Humble Opinion
IMMOR  - I Make My Own Rules
IMNSHO  - In My Not So Humble Opinion
IMO  - In My Opinion
IMOBO  - In My Own Biased Opinion
IMPE  - In My Personal/Previous Experience
IMPOV  - In My Point Of View
IMS  - I Must Say
IMVHO  - In My Very Humble Opinion
Inc.  - Incorporated
INGSI  - I'm Not Going To Say It
INPO  - In No Particular Order
INT  - I'll Never Tell
IO  - Input/Output
IOU  - I Owe You
IOW  - In Other Words
IP  - Internet Protocol
IR  - Inter Racial
IRC  - Internet Relay Chat
IRL  - In Real Life
IROOC  - I've Run Out Of Cigarettes
IRT  - In Real Time
ISC  - I Stand Corrected
ISDN  - Integrated Services Digital Network
ISO  - In Search Of
ISP  - Internet Service Provider
ISTM  - It Seems To Me
ISTR  - I Seem To Remember
IT  - Information Technology [a global term for all things now to do with computers]
ITFA  - In The Final Analysis
ITMA  - Its That Man Again
ITYM  - I Think You Mean
IUTHALORFH  - I Used To Have A Lot Of Respect For Him/Her
IUTKATS  - I Used To Know All That Stuff
IWALU  - I Will Always Love yoU
IWALY  - I Will Always Love You
IWBNI  - It Would Be Nice If
IWIK  - I Wish I Knew
IWSN  - I Want Sex Now
IYD  - In Your Dreams
IYF  - In Your Face
IYF __  - Insert Your Favourite ________
IYFEG  - Insert Your Favourite Ethnic Group
IYKWIM  - If You Know What I Mean
IYKWIMAITYD  - If You Know What I Mean And I Think You Do
IYSWIM  - If You See What I Mean

J 

JAFO  - Just Another Fucking Observer
JAFU  - Just Another Fuck Up
JAM  - Just A Moment/Minute
JAO  - Just Another Observer
JAS  - Just A Second
JFDI  - Just Fucking Do It 
JFF  - Just For Fun
JFTR  - Just For The Record
JFYI  - Just For Your Information
JIC  - Just In Case
JK  - Just Kidding
J/K  - Just Kidding
JMHO  - Just My Humble Opinion
JMO  - Just My Opinion
JMOOC  - Just My Opinion Of Course
JOTL  - Joy Of The Lord
JSYK  - Just So You Know
JTLYK  - Just To Let You Know
JTUSK  - Just Thought yoU Should Know
JTYMLTK  - Just Thought You Might Like To Know
JTYWTK  - Just Thought You Wanted To Know

K 

K  - oKay
KIA  - Know It All
KIBO  - Knowledge In BullShit Out
KISS  - Keep It Simple Stupid
KITA  - Kick In The Ass
KMA  - Kiss My Ass
KMB  - Kiss My Butt
KMWIH  - Kick Me Where It Hurts
KMYF  - Kiss Me You Fool
KOL  - Kiss On Lips
KOS  - Kids Over Shoulder
KOTC  - Kiss On The Cheek
KOTL  - Kiss On The Lips
KOTM  - Kook Of The Month
KTCOOTN  - Keep This Crap Out Of This Newsgroup
KWIM  - Know What I Mean
KYHOOTW  - Keep Your Head Out Of The Water
KYHOOYA  - Keep Your Head Out Of Your Ass
KYHU  - Keep Your Head Up
 

*L*  - To laugh. 
L8R  - Later
L8TR  - Later
LAB&TYD  - Life's A Bitch And Then You Die
LAB&TYMO  - Life's A Bitch And Then You Marry One
LAGNAF  - Let's All Get Naked And Fuck
LALL  - Live And Let Live
LAM  - Leave A Message 
LAN  - Local Area Network
LATBOTG  - Look At the Boobs on That Girl
LDTO  - Lets Ditch This One
LDWPKOL  - Long Deep Wet Passionate Kiss On the Lips
LHM  - Lord Help Me
LHU  - Lord Help Us
LJBF  - Let's Just Be Friends
LLAP  - Live Long And Prosper
LLTA  - Lots and Lots of Thunderous Applause
LMA  - Leave Me Alone
LMAO  - Laughing My Ass Off
LMAOROTF  - Laughing My Ass Off Rolling On The Floor
LMC  - Lost My Connection
LMCOA  - Lost My Connection Once Again
LMFAO  - Laughing My Fucking Ass Off
LMK  - Let Me Know
LMTFA  - Leave Me The Fuck Alone
LOAO  - Laughing Our Ass Off
LOFLOL  - Lying On Floor Laughing Out Loud
lol  - Laugh out Loud
LOL  - Laughing Out Loud; Little Old Lady; Lots of Love
LOWOTFBTC  - Laughing Out Waving On The Floor Biting The Carpet
LSFIAB  - Like Shooting Fish In A Barrel
LSHIH  - Laughing So Hard It Hurts
LSHIPMP  - Laughing So Hard I Peed My Pants
LSHMBIB  - Laughing So Hard My Belly Is Bouncing
LSMIF  - Laughing So Much I Farted
LSMISMT  - Laughing So Much I Shot My Tampax
LSP  - Less Sensitive Person
LTBF  - Learn To Be Funny
LTIP  - Laughing 'Til I Puke
LTM  - Laughing To Myself
LTMSH  - Laughing 'Til My Sides Hurt
LTNS  - Long Time No See
LUSER  - Loser USER
LY  - Love ya
ly2p  - Love You To Pieces 
LYLAB  - Love You Like A Brother
LYLAS  - Love You Like A Sister
LYWAMH  - Love You With All My Heart

M 

M  - Male
M8  - Mate
MAY  - Mad About You
MAYB  - Mad About You Baby
MB  - Message Board
MBR  - Master Boot Record
MCIBTY  - My Computer Is Better Than Yours
MD  - Mailed
MDT  - Mountain Daylight savings Time
ME2  - Me Too
MFC  - Merge From Current [FreeBSD] 
MFG  - More Friendly Garbage
MFIC  - Mother Fucker In Charge
MFWIC  - Mother Fucker What's In Charge
MHBFY  - My Heart Bleeds For You
MHDC  - My Hard Drive Crashed
MHM  - Members Helping Members
MHOTY  - My Hat's Off To You
MIL  - Mother In Law
MIME  - Multi-purpose Internet Mail Extensions
MING  - Mailing
MIPS  - Meaningless Information Per Second
ML  - More Later
MLA  - Multiple Letter Acronym
MM  - Multi Media
MMF  - Make Money Fast - a type of spam, illegal in most countries
MMIF  - My Mouth Is Full
MMX  - Multi-Media eXtensions
MNC  - Mother Nature Calls
MOF  - Matter Of Fact
MOMN  - Milk Out My Nose
MORF  - Male OR Female
MOS  - Member of the Opposite Sex
MOTAS  - Member Of The Appropriate Sex
MOTD  - Message Of The Day
MOTOS  - Member Of The Opposite Sex
MOTSS  - Member Of The Same Sex
MPH  - Miles Per Hour
MS  - More Shit; More of the Same
MSIE  - Microsoft Internet Explorer
MSM  - MicroSoft Network 
MSS  - Member of the Same Sex
MT  - My Time
MTFBWY  - May The Force Be With You
MUD  - Multi-User Dungeon/Domain
MUNG  - Mash/Mung Until No Good
MYBABLB  - My You've Been a Busy Little Bee/ Boy.
MYOB  - Mind Your Own Business

N 
 
NADM  - Never A Dull Moment
NAD  -  Need Another Drink
NAGI  - Not A Good Idea
NANAE  - news.admin.net-abuse.email [Usenet newsgroup]
NANAU  - news.admin.net-abuse.usenet [Usenet newsgroup]
NAVY  - Never Again Volunteer Yourself
NA  - Not Available 
NBD  - No Big Deal
NBL  - Not Bloody Likely
NBTD  - Nothing Better To Do
NCB  - Never Change Baby
NDB  - None of your Damned Business
NDM  - No Disrespect Meant
NE1  - Anyone
NERD  - National Establishment for Real Dorks
NFG  - No Fucking Good
NFI  - No Fucking Idea
NFW  - No Fucking Way
NFY  - No - Fuck You
NGT  - Not Gonna Tell
NHOH  - Never Heard Of Her/Him
NICBDAT  - Nothing Is Certain But Death And Taxes
NIDWTC  - No I Don't Want To Chat
NIH  - Not Invented Here
NIMBY  - Not In My Back Yard
NINO  - Nothing In Nothing Out
NIT  - Not In Therapy
NLI  - Not Logged In
NLT  - No Later Than
NM  - Never Mind
N/M  - Never Mind
NMI  - No Middle Initial
NMP  - Not My Problem
NMS  - Not My Style
NMSAA  - Not My Style At All
NN  - Night Night
NNTP  - Network News Transfer Protocol
NoCeM  - No See 'eM
NOOTO  - Nothing Out Of The Ordinary
NOYB  - None Of Your Business
NP  - No Problem
NPF  - No Problem Found
NPLU  - Not People Like Us
NQA  - No Questions Asked
NQOS  - Not Quite Our Sort
NRN  - No Reply Necessary
NS  - Netscape
NSS  - No Shit Sherlock
NT  - No Text
NTG  - Not Too Good
NTH  - No Therapy Helpful
NTIBOA  - Not That I'm Bitter Or Anything
NTIM  - Not That It Matters
NTIMM  - Not That It Matters Much
NTL  - None The Less/Never The Less
NTP  - Need To Pee
NUI  - Network User Identification
NYCTMI  - Now You Come To Mention It
NYI  - Not Yet Implemented
NYM  - New York Minute
NYP  - Not Your Problem

O 
 
O  - Over [to you]
OATUS  - On A Totally Unrelated Subject
OAUS  - On An Unrelated Subject
OB  - OBligatory; Oh Baby
OBTW  - Oh By The Way
OD  - OverDose; Oh Dear
OFS  - One Finger Salute [the 'bird']
OGIMA  - Oh God It's Monday Again
OIC  - Oh I See
OMA  - On My Ass
OMB  - On My Butt
OMBLMAO - On My Butt Laughing My Ass Off
OMFG  - Oh My Fucking God
OMG  - Oh My God
OMM  - On My Monitor
ONNA  - Oh No Not Again
ONNTA  - Oh No Not That/This Again
OO  - Over and Out
OOC  - Out Of Character
OOI  - Out Of Interest
OOSOOM  - Out Of Sight Out Of Mind
OOTC  - Obligatory On Topic Comment [indicates that part of a message that pertains in some way to the Usenet newsgroup that the message appears in]
OS  - Operating System
OSIM  - Oh Shit It's Monday
OT  - Off Topic
OT1H  - On The One Hand
OTC  - Over The Counter
OTD  - Out The Door
OTF  - On The Floor [mad laughter]
OTGH  - On The Gripping Hand
OTL  - Out To Lunch
OTOH  - On The Other Hand
OTT  - Over The Top
OTTH  - On The Third Hand
OTTOMH  - Off The Top Of My Head
OTW  - On The Whole
OW  - Oh Well
OWTTE  - Or Words To That Effect

P 

PABG  - Pack A Big Gun
PAW  - Parents Are Watching
PBM  - Play By Mail (games)
PBNFL  - Possible, But Not Fucking Likely
PC  - Personal Computer/ Politically Correct
PCB  - Please Call Back
PCMCIA  - People Can't Master Computer Industry Acronyms
PD  - Public Domain
PDA  - Personal Digital Assistant 
PDA  - Public Display of Affection
PDN  - Public Data Network
PDQ  - Pretty Damn Quick
PDS  - Please Don't Shout
PDT  - Pacific Daylight savings Time
PEBCAK  - Problem Exists Between Chair And Keyboard
PEM  - Privacy Enhanced Mail
PEST  - Please Excuse Slow Typing
PFM  - Pure 
PGP  - Pretty Good Privacy
PhD  - Piled Higher and Deeper
PIC  - Politically InCorrect
PIDOOMA  - Pulled it directly out of my ass
PIMP  - Pee In My Pants
PITA  - Pain In The Ass
PKB  - Pot calling the Kettle Black
PKOC  - Passionate Kiss On the Cheek
PKOL  - Passionate Kiss On the Lips
PLMK  - Please Let Me Know
PLOKTA  - Press Lots Of Keys To Abort
PLS  - Please
PLZ  - Please
PMBI  - Pardon My Butting In
PMFBI  - Pardon Me For Butting In
PMFI  - Problem Magically Fixed Itself
PMFJI  - Pardon Me For Jumping In
PMFJIH  - Pardon Me For Jumping In Here
PMJI  - Pardon My Jumping In
PMP  - Peed My Pants
PO  - Piss Off
POAHF  - Put On A Happy Face
POM  - Phase Of the Moon
POP  - Point Of Presence; Post Office Protocol
POQ  - Piss Off Quickly
POQADCB  - Piss Off Quickly And Don't Come Back
POS  - Parents Over Shoulder
POTS  - Plain Old Telephone Service/System
POV  - Point Of View
PPL  - PeoPLe
PPP  - Point-to-Point Protocol; Petty Pet Peeve
PPPP  - Previous Paragraph was Polemical Position
PS  - Post Script
PST  - Pacific Standard Time
PTB  - Powers That Be
PTHBS  - Proud To Have Been Seminal
PTL  - Praise The Lord
PTLAPTA  - Praise The Lord And Pass The Ammunition
PTMM  - Please Tell Me More
PTMY  - Pleased To Meet You
PTMYA  - Pleased To Make Your Acquaintance
PTO  - Please Turn Over
PW  - Pathetic Wanker; PowWow

Q 
 
Q  - Queue
QED  - Quite Easily Done
QPQ  - Quid Pro Quo
QT  - Cutie; Quiet

R 

R - Are
RA  - Red Alert
RAM  - Random Access Memory 
RAS  - Running And Screaming
RE  - REgarding
REHI  - Hi Again (repeat hi)
RFC  - Request For Comment
RFD  - Request For Discussion
RFM  - Reply To Flagged Message
RFN  - Right Fucking Now
RFT  - Request For Thinking
RL  - Real Life
RLCO  - Real Life COnference
RNA  - Ring No Answer
ROFFNAR  - Rolling On the Floor For No Apparent Reason
ROFL  - Rolling On Floor Laughing
ROFLMAO  - Rolling On Floor Laughing My Ass Off
ROFLMAOBT  - Rolling On Floor Laughing My Ass Off Big Time
ROFLMAOPMP  - Rolling On Floor Laughing My Ass Off Peeing My Pants
ROFLMHO  - Rolling On Floor Laughing My Head Off
ROFLOL  - Rolling On the Floor Laughing Out Loud 
ROFLUTS  - Rolling On Floor Laughing Unable To Speak
ROFLWPIMP  - Rolling On Floor Laughing Whilst Peeing In My Pants
ROFLWTIME  - rolling on floor laughing wiping tears in my eyes 
ROTBA  - Reality On The Blink Again
ROTF  - Rolling On The Floor
ROTFL  - Rolling On The Floor Laughing
ROTFLAS  - Rolling On The Floor Laughing And Snorting
ROTFLMAO  - Rolling On The Floor Laughing My Ass Off
ROTFLMAOSHTCCOMNAIWEDA  - Rolling On The Floor Laughing My Ass Off So Hard That Coke Came Out My Nose And I Wasn't Even Drinking Any
ROTFLMBO  - Rolling On The Floor Laughing My Balls Off
ROTFLSHISMC  - Rolling On The Floor Laughing So Hard I Spilt My Coffee
ROTFLSTCIIHO  - Rolling On The Floor Laughing Scaring The Cat If I Had One
ROTM  - Right On The Money
RPG  - Role Playing Game
RSN  - Real Soon Now
RT  - Real Time
RTDM  - Read The Damn Manual
RTF  - Rich Text Format, Microsoft document format
RTFF  - Read The Fucking FAQ(s)
RTFI  - Read The Fucking Instructions
RTFM  - Read The Fucking Manual
RTFN  - Right The Fuck Now
RTFQ  - Read The Fucking Question
RTFS  - Read The Fucking Source
RTS  - Read The Screen
RU18  - Are You Eighteen 
RUMF  - aRe yoU Male or Female
RUMORF  - aRe yoU Male Or Female

S

S  - *Smile*
SAHM  - Stay At Home Mum
SAMFUTU  - Situation Abnormal More Fucked Up Than Usual
SAPFU  - Surpassing All Previous Fuck Ups
SAR  - Smart Ass Remark
SAS  - Short Attention Span 
SBID  - Shitty But It'll Do
SCNR  - Sorry, Could Not Resist
SEC  - SECond, e.g. Wait a sec
SEG  - Shit Eating Grin
SEP  - Somebody Else's Problem
SETE  - Smiling Ear To Ear
SFAIAA  - So Far As I Am Aware
SFLA  - Stupid Four Letter Acronym
SGML  - Standardised Generalised Markup Language
SH  - Shit Happens
SHTSI  - Somebody Had To Say It
STFU – Shut The Fuck Up
SIG  - Special Interest Group or SIGnature File
SIIK  - Stuffed If I Know
SIL  - Sister In Law
SIT  - Stay In Touch
SITD  - Still In The Dark
SLIP  - Serial Line Interface Protocol
SMD  - Suck My Dick
SMO  - Serious Mode On
SMOFF  - Serious Mode OFF
SMOP  - Simply a Matter Of Programming
SMTP  - Simple Mail Transfer Protocol
SNAFU  - Situation Normal All Fucked Up
SNERT  - Snot-Nosed Egoistical Rude Teenager
SNR  - Signal To noise Ratio
SO  - Significant Other
SOHB  - Sense Of Humour Bypass
SOI  - State Of Insanity
SOL  - Shit Out of Luck
SOP  - Standard Operating Procedure
SOS  - Same Old Shit
SOSH Same Old Stuff/Shit Here
SOT  - Short Of Time
SOTMG  - Short Of Time Must Go
SOVS  - Some One Very Special
SPAM  - SPiced hAM [now a common term on the Internet used to refer to Unsolicited Bulk Email, and unsolicited multiple postings to one or more Usenet newsgroups]
SRY  - Sorry
SSDD  - Same Shit Different Day
SSI  - Subject Says It [in email and newsgroup message titles]
SSINHH – Some Shit In Her Head
ST  - Such That; Star Trek
STFU  - Shut The Fuck Up
STR8  - Straight
STS  - So To Speak
SUCDIC  - Situation Under Control Dickheads In Charge
SUFID  - Screwing Up Face In Disgust
SUL  - See yoU Later
SUNOILTY  - Shut Up No One Is Listening To You
SUP  - what'S UP
SUYP  - Shut Up You Pervert
SWAK  - Sealed With A Kiss
SWALK  - Sealed With A Loving Kiss
SWDYRTW  - Since When Do You Rule The Web
SWL  - Screaming With Laughter
SWMBO  - She Who Must Be Obeyed
SWYP  - So What's Your Problem
SYL  - See You Later
SYSOP  - SYStem OPerator
SYT  - Sweet Young Thing

T 

TABA  - Throws A Beer At
TAF  - That's All Folks
TAFN  - That's All For Now
TANJ  - There Ain't No Justice
TANSTAAFL  - There Ain't No Such Thing As A Free Lunch
TARFU  - Things Are Really Fucked Up
TAWIS  - That Ain't What I Said
TBC  - To Be Continued
TBE  - To Be Expected
TBYB  - Try Before You Buy
TC  - Telephone Call; Take Care
TCB  - Taking Care of Business
TCD  - The Cat's Dead
TDD  - The Dog's Dead
TDM  - Too Damn Many
TEOTWAWKI  - The End Of The World As We Know It
TFB  - Too Fucking Bad
TFE  - Too Fucking Easy
TFIF  - Thank Fuck It's Friday
TFS  - Three Fingered Salute [Ctrl-Alt-Del]
TFTT  - Thanks For The Thought
TGAL  - Think Globally Act Locally
TGIF  - Thank God It's Friday
TGTF  - Thank God Tomorrow's Friday
TIA  - Thanks In Advance
TIATLG  - Truly I Am The Living God
TIC  - Tongue In Cheek
TIIC  - Those Idiots In Control
TILMAO  - Thought I'd Laugh My Ass Off
TIME  - Tears In My Eyes
TIMTOWTDI  - There Is More Than One Way To Do It
TINALO  - This Is Not A Legal Opinion
TINAR  - This Is Not A Recommendation
TINWIS  - That Is Not What I Said
TIP  - To Insure Promptness
TLA  - Three Letter Acronym
TLC  - Tender Loving Care
TLG  - The Living God
TM  - Thread Mangler
TMI  - Too Much Information
TMIKTLIU  - The More I Know The Less I Understand
TN  - TelNet
TNOTVS  - There's Nothing On TeleVision So
TNX  - Thanks
TPAE  - The Possibilities Are Endless
TPS(S)  - This Program Sucks (Severely)
TPTB  - The Powers That Be
TQVM  - thank you very much
TRDMC  - Tears Running Down My Cheeks
TROLL  - To deliberately provoke an argument in a newsgroup, mailing list or chat room.
TS  - Tough Shit; Top Secret
TSOHF  - Total Sense Of Humour Failure
TSR  - Terminate and Stay Resident (program); Totally Stupid Rules
TTBE  - That's To Be Expected
TTBOMK  - To The Best Of My Knowledge
TTFN  - Ta Ta For Now
TTL4N  - That's The Lot For Now
TTM  - To The Moderator
TTSP  - This Too Shall Pass
TTTT  - These Things Take Time
TTYL  - Talk To You Later
TTYRS  - Talk To You Real Soon
TVB  - Top Versus Bottom
TWAIN  - Technology Without An Important Name
TWIMC  - To Whom It May Concern
TWIS  - That's What I Said
TWYAS  - That's What You All Say
TWYT  - That's What You Think
TY  - Thank You
TYT  - Take Your Time [often used in reply to BRB (cf)]
TYVM  - Thank You Very Much

U 

U - You
UAE  - Unrecoverable Application Error
UBE  - Unsolicited Bulk Email
UFLA  - Unidentified Four Letter Acronym
UGTBK  - yoU've Got To Be Kidding
UL  - UpLoad
U/L  - UpLoad
UOK  - yoU OK?
URL  - Uniform Resource Locator
URLCM  - yoU aRe weLCoMe
URVS  - yoU aRe Very Sexy 
USU  - USUally
UT4S  - yoU Type For Shit
UTC  - TIME
UTT  - Under The Table
UUCP  - Unix-toUnix CoPy

V 

VBG  - Very Big Grin
VDPKOL  - Very Deep Passionate Kiss On the Lips
VDWPKOL  - Very Deep Wet Passionate Kiss On the Lips
VH - Virtual Hug
VR  - Virtual Reality
VRML  - Virtual Reality Modelling Language
VT  - Virtual Time

W 

W/  - With
W8  - Wait
W8ING  - Waiting
W8NC  - Wait And See 
WAB  - What Another Bill
WAEF  - When All Else Fails
WAG  - Wild Assed Guess
WALOC  - What A Load Of Crap
WAN  - Wide Area Network
WAREZ  - Softwares, normally illegal distributed on the net
WB  - Welcome Back
WBS  - Write Back Soon
WBSP  - Write Back Soon Please
WCAGA  - What Comes Around Goes Around
WDYMBT  - What Do You Mean By That
WEFT  - Wrong Every Fucking Time
WFHC  - Why For How Come?
WFM  - Works For Me
WGAFF  - Who Gives A Flying Fuck
WGAS  - Who Gives A Shit
WIBNIF  - Wouldn't It Be Nice IF
WMMOWS  - Wash My Mouth Out With Soap
W/O  - With Out
WOA  - Work Of Art
WOFT  - Waste Of Fucking Time
WOFTAM  - Waste Of Fucking Time And Money
WOM  - Word Of Mouth
WOMBAT  - Waste Of Money Brains And Time
WOS  - Wife Over Shoulder
WOW  - Wish Only Well 
WPKOL  - Wet Passionate Kiss On the Lips
WRT  - With Regard/Respect To
WSDMU  - We Sure Did Miss yoU
WTF  - What The Fuck 
WTFDIC  - What The Fuck Do I Care
WTFDIK  - What The Fuck Do I Know
WTFDYTYA  - Who The Fuck Do You Think You Are
WTG  - Way To Go (Well Done!)
WTH  - What The Hell/Heck
WUC  - Why yoU Cry?
WWW  - World Wide Web; World Wide Wait
WWYC  - Write When You Can
WYGIWYG  - What You Got Is What You Get
WYGIWYPF  - What You Get Is What You Pay For
WYM  - What You Mean?
WYP  - What's Your Point?
WYSIWYG  - What You See Is What You Get
WYSOH  - Where's Your Sense Of Humour?

X 

XG  - eXcellent Garth
XTLA  - eXtended Three Letter Acronyme
XW  - eXcellent Wayne
XYZ  - eXamine Your Zipper

Y 

Y2K  - The Year 2000
YAABH  - You Are A Big Help
YABA  - Yet Another Bloody Acronym
YAOTM  - Yet Another Off-Topic Message
YBS  - You'll Be Sorry
YCIITM  - Your Check / Cheque Is In The Mail
YCLIU  - You Can Look It Up
YCTFS  - You Can't Type For Shit
YGGM  - Your Guess is as Good as Mine
YGM  - You've Got Mail
YGTBK  - You've Got To Be Kidding
YHB___  - You Have Been ___
YHBW  - You Have Been Warned
YHL  - You Have Lost
YHTBT  - You Had To Be There
YIAH  - Yes I Am Here
YKWIM  - You Know What I Mean
YKYATP  - You Know You're A Tired Parent
YM  - You Mean
YMMV  - Your Mileage May Vary [it could be different for you]
YOYO  - You're On Your Own
YOYOW  - You Own Your Own Words
YSS  - You Suck Severely
YT  - Yours Truly
YTMOB  - You Turn Me On Baby
YW  - You're Welcome
YWIA  - You're Welcome In Advance
YWSYLS - You Win Some You Lose Some
YYSSW  - Ya Ya Sure Sure Whatever

Z 

ZN  - ZiffNet