Here is a list of useful & useless acronyms and abbreviations.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

~A~

404	I have no clue (error message 404, address not found)
^5	High Five
AAA	Any Advice Appreciated
ADGR	All Donations Gratefully Received
ADN	Any Day now
AFAIAA	As Far as I am Aware
AFAIR	As Far as I Recall
AFAICS	As Far as I can see
AFAICT	As far as I can tell
AFAIK	As Far As I know
AGAN	As good as new
AFK	Away From Keyboard
AKA	Also Known As
AI	As If
ANAWFOS	And now a word from our sponsor
ASAP	As Soon As Possible
ASWGAFF	Ask Someone Who Gives A Flying Fuck!
A/S/L	Age / Sex / Location
ATM	At The Moment
ATTN	ATTENTION!
AWHFY	Are we having fun yet?
AWOL	Absent without Leave
AYT	Are you there?

~B~

B	Be
B4	Before
BAK	Back at Keyboard
BAY	Back At You
BAS	Big Ass Smile
BBIAF	Be Back in a few
BBL	Be Back Later
BBN	Bye Bye Now
BBS	Be Back Soon
BBS	Bulletin Board System
B/C	Because
BCC	Blind Carbon Copy
BCNU	(I'll) Be Seeing You
BEG	Big Evil Grin
BF	Boyfriend
BFD	Big Fucking Deal
BFN	Bye For Now
BIBO	Beer In - Beer Out
BIF	Basic in Fact
BION	Believe it or not
BIOYA	Blow it out you're Ass
BMOC	Big man on campus
BOC	But of course
BOT	Back on Topic
BRB	Be Right Back
BS	Bull Shit
BSF	But Seriously Folks!
BTDT	Been There Done That
BTDTGAS	Been There Done That-Got a Shirt
BTL	Better Than Life
BTSOOM	Beats the Shit out of Me
BTW	By The Way
BWL	Bursting With Laughter
BY	BusY
BYOB	Bring your own bottle (booze)

~C~

C	See
C&G	Chuckle and Grin
CB	Call Back
CFD	Call for discussion
CGI	Common Gateway Interface
CICO	Coffee In, Coffee Out
CID	Crying In Disgrace
CM (C/M)	Call Me
CNP	Continued (in my) Next Post
CP	Chat Post (a chat message)
CPU	Central Processing Unit (The brains of your computer)
CRAFT	Can't Remember a Fucking Thing
CRBT	Crying Real Big Tears
CSG	Chuckle, Snicker, Grin
CU	See You
CUL8R	See you Later
CYA	See Ya!
CYAL8R	See You Later
C4N	Ciao for Now

~D~

DAY	Dreamed About You
DFG	Devilish Fucking Grin
DGUTDJ	Don't Give up the Day Job!
DILLIGAF	Do I Look Like I Give a Fuck!
DL (D/L)	Download
DLTBBB	Don't Let The Bed Bugs Bite
DOS	Disk Operating System
DQM	Don't Quote Me
DQMOT	Don't Quote me on that/this
DWISNWID	Do What I say, Not What I do
DYJHIW	Don't You just hate it when.....

~E~

EG	Evil Grin
EMSG	Email Message
EOD	End of Discussion
EOF	End of File
ESAD (ES&D)	Eat Shit and Die
ETLA	Extended Three Letter Acronym

~F~

F2F	Face to Face
FAQ	Frequently Asked Questions
FC	Fingers Crossed
FEIYD	For Ever in your Debt
FOAF	Friend of a friend
FOCL	Falls off Chair laughing
FTBOMH	From the Bottom of my Heart
FTP	File Transfer Protocol
FOAD	Fuck off and Die
FU	Fucked up!
FUBAR	Fucked up beyond all Recognition
FYA	For your Amusement
FYI	For your Information
FWIW	For What it's Worth

~G~

<G>	Grin (add <> for bigger grins. <<<G>>> a BIG BRIN)
GA	Go Ahead
GAC	Get A Clue
GAG	Get A Grip
GAL	Get A Life
GF	Girlfriend
GFN	Gone For Now
GGL	Giggle
GMBO	Giggling my butt off
GMTA	Great Minds Think Alike
GR&D	Grinning, Running, & Ducking
GTSY	Glad to see You

~H~

H&K	Hugs & Kisses
HABU	Have a Better 'un
HAGN	Have a Good Night
HAGU	Have a Good 'un
HAND	Have a Nice Day
HHIS	Hanging Head in Shame
HHOJ	HA! HA! Only Joking!
HTH	Hope this helps
HUB	Head up Butt
HWISTKT	How was I supposed to know that?

~I~

IAE	In Any Event
IAH	In All Honesty
IANAL	I am not a lawyer... (BUT..)
IC	I See
ICBW	I could be wrong
ICQ	I Seek You
ICYDK	In case you didn't know
IDK	I Don't Know
IGP	I Gotta Pee
IIABDFI	If it ain't broke, don't fix it!
IIDKB	If I didn't know better
IIR	If I Recall (Remember)
IIRC	If I Remember correctly
IIWY	If I were you...
IKWYM	I know what you mean
IM	Instant Message
IMCO	In My Considered Opinion
IMD14U	I'm the One For You
IME	In My Experience
IMO	In My Opinion
IMHO	In My Humble Opinion
IMNSHO	In My Not So Humble Opinion
IOW	In Other Words
IRC	Internet Relay Chat
IRL	In Real Life
IRMC	I Rest My Case!
ISC	I stand Corrected!
ISP	Internet Service Provider
ISTM	It seems to me
ISTR	I Seem To Recall...
ISWYM	I See What You Mean
ITRW	In the Real World
IWALU	I will always love you
IWFM	It works for me
IWW?	I wonder why?
IYDMMA	If you don't mind me asking
IYKWIM	If you know what I mean

~J~

JAM	Just a Minute
JFTR	Just for the record
JK	Just Kidding
JMO	Just My Opinion
JTLYK	Just To Let You Know
JTFM	Just the fact, man

~K~

K	Okay
KISS	Keep it simple, stupid
KIT	Keep in Touch
KMA	Kiss My Ass
KOC	Kiss on Cheek (Also KOTC)
KOL	Kiss on Lips (Also KOTL)

~L~

L	Laugh
L8R	Later
L8R G8R	Later Gator
LHM	Lord Help Me
LHO	Laughing head Off
LHU	Lord Help us
LMAO	Laughing My A$$ Off
LMSO	Laughing My Socks Off
LOL	Laughing out Loud
Loff	Log Off
Lon	Log On
LSHMBB	Laughing So Hard My Belly is Bouncing
LSHMBH	Laughing So Hard My Belly Hurts
LSHTTARDML	Laughing So Hard The Tears Are Running Down My Leg
LTNS	Long Time No See
LTS	Laughing To Self
LUWAMH	Love You With All My Heart
LY	Love Ya

~M~

MHOTY	My Hat's off to you
MHBFY	My heart bleeds for you
MIDI	Musical Instrument Digital Interface
MorF (M/F)	Male or Female
MOF	Matter of Fact
MOTD	Message of the Day
MOTSS	Members of the same sex
MSG	Message
MTF	More To Follow
MUD	Multi-user Dungeon
MYOB	Mind your own business

~N~

N/A	Not Applicable
NADT	Not a Damn Thing
NBIF	No basis in fact
NC	No Comment
NE1	Anyone
NFW	No Fucking Way!
NIMBY	Not in my back yard
NM	Never Mind
NP	No Problem
NPD	No Problem Dude
NRN	No reply Necessary
NP	No Problem
NTOOT	Nine times out of ten
NWIH	No Way in Hell

~O~

OAO	Over and Out
OIC	Oh I See
OL	Ol Lady
OM	Old Man
OMG	Oh My God
OOTB	Out of the blue or Out of the Box
OS	Operating System
OTF	On the floor
OTOH	On the other hand
OTP	On The Phone
OTTOMH	Off the top of my head

~P~

PDA	Public Display of Affection
PDQ	Pretty darn Quick
PDS	Please Don't Shoot
PITA	Pain in the Ass
PM	Private Message
PMFJI	Pardon Me for jumping in
PMP	Pee'd my pants
POAHF	Put On A Happy Face
POV	Point of view
PPL	People
PS	Post Script

~Q~

Q	Question
QSL	Reply
QSO	Conversation
QT	Cutie
QTAB	Cute as a button
QTP	Cutie pie

~R~

R	Are
RCI	Rectal-Cranial Inversion
Re	Regarding
ROTFL	Rolling On The Floor Laughing
ROTFLAPMP	ROTFL And Peeing My Pants
ROTFLMAO	ROTFL My Ass Off
ROTFLMAOAY	ROTFLMAO At You
ROTFLMAOWTIME	ROTFLMAO With Tears In My Eyes
ROTFLUTS	ROTFL Unable to Speak
RSF	Right Said! Fred
RSN	Real Soon Now
RTFM	Read the Fucking Manual
RTI	Real Time Interruption
RUOK	Are you OK?

~S~

(S)	Smile add more ('s for bigger smiles
SETE	Smile Ear to Ear
SHID	Slaps Head In Disgust
SID	So I do
SITD	Still in the Dark
SNAFU	Situation Normal, All Fucked up!
SNERT	Snot-Nosed Egotistical Rude Teenager
SO	Significant Other (husband, wife, boyfriend, girlfriend,etc
SorG (S/G)	Straight or Gay?
SOHF	Sense of Humor Failure
SOT	Short of Time
SOTMG	Short Of Time Must Go
SPAM	Stupid Peoples Advertisement
STB	Simply the Best
SWAK	Sealed with a Kiss
SWL	Screaming with Laughter
SYS	See Ya Soon

~T~

TA	Thanks Again
TAL	Thanks a Lot
TAT	Turnaround time
TBIB	The Bitch is back
TC	Telephone Call
TCP/IP	Transmission Control Protocol / Internet Protocol
TCOY	Take Care of yourself
TDM	Too Damn Many...
TIA	Thanks in Advance
TIC	Tongue in Cheek
TILII	Tell it like it is
TMTT	Too Much to type
TNSTAAFL	There's no such thing as a free lunch
TNT	Till Next Time
TNTL	Trying Not To Laugh
TVHNTL	Trying Very Hard Not To Laugh
TNTPIMP	Trying Not To Pee In My Pants
TRRHNTPIMP	Trying Really Really Hard Not To Pee In My Pants
TOY	Thinking of you
TPTB	The Powers that be
TTFN	Ta Ta For Now
TTFS	Try this for size
TTYL	Talk to ya later
TYVM	Thank you very much

~U~

U	You
UL (U/L)	Upload
UnPC	Un-politically Correct
URL	Universal Resource Locator

~V~

VC	Virtual Community
VEG	Very Evil Grin
VGI	Very Good Idea

~W~

(W)	Wink
WABOL	What a bunch of losers
WAIDW	What am I doing wrong?
WAS	Wild Ass Guess
WB	Welcome Back
WBS	Write Back Soon
WEG	Wicked Evil Grin
WHYD	What have you done?
W/O	Without
WTFRU	Who the fuck are you?
WOB	Without Boyfriend
WOG	Without Girlfriend
WTG	Way to Go
WTH?	What/Who The Hell (or sub an 'F' for the 'H')
WUASTC	Wake up and smell the coffee
WYMM	Will you Marry Me?
WYSIWYG	What you see is What you get

~X~

XHNS

eXtra Hot 'N Spicy

~Y~

YBS	You'll Be Sorry
YG	Young Gentleman
YGWYPF	You get what you pay for
YL	Young Lady
YM	Young Man
YWSYLS	You win some, you lose some

~Z~

ZIAO

Zoning in and out