From Paul Gil,
Your Guide to Internet for Beginners.
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Part 2A: The Most Common Internet Abbreviations:
Reminder: 90% of the time, these expressions are typed in all lowercase letters. On selective occasions, you are welcome to use them in all capitals to express enthusiasm. Just remember not to type entire sentences in all caps, lest you be considered rude.

BRB – be right back
BIO – going for bio break (washroom break)
AFK – away from keyboard (I am gone for a few minutes)
BTW – by the way
KK – OK (commonly used by online gamers to acknowledge that a message has been received)
TTYL – talk to you later
BFN – bye for now
TTFN – ta-ta for now
CYA – see ya (or it could also be: cover your a*s)
CUL8R – see you later
IBTL – in before the lock (for when you post a message prior to the administrator locking the heated discussion thread)
IMHO – in my humble opinion
IMNSHO – in my not so humble opinion
FMV – fair market value (for selling items online)
LOL – laughing out loud
MT – mistell (commonly used by online gamers to say that they made a mistake and mistyped their last message)
NWT – new with tags (for selling items online)
NWOT – new without tags (for selling items online)
OOAK – one of a kind (for selling items online)
PMSL - P*ssing myself laughing (a common UK expression)
ROFL – rolling on floor laughing
ROFLMAO – rolling on floor laughing my a*s off
RTM – read the manual
RTFM – read the f***ing manual (to show frustration at someone's ignorance of basic knowledge)
GG – good game
THX - thanks
TX - thanks
TY - thank you
NP - no problem/you're welcome
PLZ - please
W/E - whatever
ASL – age / sex / location?
RL – real life
IRL – in real life


More acronyms follow below, and on the next two pages.


Part 2B: A Longer List of Internet Abbreviations:

.02 My two cents worth.
<chuckle> the speaker chuckles
<frown> the speaker is frowning
<g> Grin
<grin> the speaker is grinning
<smile> the one writing the message is smiling
<smirk> the one writing the message is smirking
<wink> the one writing the message is winking
JK Just Kidding
? I have a question
! I have a comment
A-OLs Administrators On-Line
AAMOF As A Matter Of Fact
AFAIK As Far As I Know
AFK Away From the Keyboard
AISI As I See It
ASAP As Soon As Possible ASL Age, sex, location
ATSL Along The Same Line
AWTTW Are We Having Fun Yet?
AYOR At Your Own Risk
B4N Bye For Now
BAK Back At Keyboard
BBFN Bye Bye For Now
BBL Be Back Later
BF Boy Friend
BFN Bye For Now
BIF Before I Forget
BION Believe it or not
BOT Back On Topic
BRB Be Right Back
BTAIM Be That As It May
BTHOM Beats The Hell Outta Me
BTOBD Be There Or Be Dead
BTW By The Way
BWL Bursting With Laughter
BYKT But You Knew That
BYOB Bring Your Own Bottle
CMIIW Correct Me If I’m Wrong
CU See You
CU2 See You, Too
CUL See you later
CUL8R See You Later
CWYL Chat With You Later
DIIK Damned If I Know.
DIKU? Do I Know You?
DILLIGAD Do I Look Like I Give A Darnn?.
DIY Do It Yourself
DK Don’t Know
F2F Face To Face
FCFS First Come, First Served
FISH First In, Still Here
FITB Fill In The Blank
FOAD F*** off and die
FOAF Friend Of A Friend
FS For Sale
FTASB Faster Than A Speeding Bullet
F2F Face to Face
FTF Face To Face
FTL Faster Than Light
FUBAR Fouled Up Beyond All Repair
FUBB Fouled Up Beyond Belief.
FUD Fear, Uncertainty and Doubt
FURTB Full Up Ready To Burst
FWIW For What It’s Worth
FYA For Your Amusement
FYI For Your Information
G Grin, or Giggle
G2G Got to Go
GA Go Ahead
GAL Get A Life
GD&R Grinning, Ducking and Running
GF Girl Friend.
GFN Gone For Now.
GIWIST Gee, I Wish I’d Said That
GLGH Good Luck and Good Hunting
GMTA Great Minds Think Alike
GOWI Get On With It
GTG Got To Go
GTSY Great To See You
H&K Hugs and Kisses
HAK Hugs And Kisses
IAC In Any Case
IAE In Any Event
IANAL I Am Not A Lawyer (but) A disclaimer which is usually followed by a legal opinion
IAW In Accordance With
IBTD I Beg To Differ
IC I See
IDK I Don't Know
IIWM If It Were Me
IJWTK I Just Want To Know
IJWTS I Just Want To Say
IKWUM I Know What You Mean
IMA I Might Add
IME In My Experience
IMHO In My Humble Opinion
IMNSHO In My Not So Humble Opinion
IMO In My Opinion
IMPOV In My Point Of View
INPO In No Particular Order
IOW In Other Words
IRL In Real Life
ISS I’m So Sure
ISSYGTI I’m So Sure You Get The Idea!
ISWYM I See What You Mean
ITFA In The Final Analysis
ITSFWI If The Shoe Fits Wear It.
IYSWIM If You See What I Mean
JAM Just A Minute
JAS Just A Second
JFI Just For Information
JIC Just In Case
JMO Just My Opinion
JTLYK Just To Let You Know
k Okay
KISS Keep It Simple, Stupid
KIT Keep In Touch
KMA Kiss My A**
KWIM Know What I Mean?
KYFC Keep Your Fingers Crossed


Related Article: Internet Emoticons and Smileys