BTW

 AFAIK, As Far As I know
 AFK, Away From Keyboard
 AKA, Also Known As
 ASAP, As Soon As Possible
 ATYS, Anything You Say
 Acronimo
 B4, Before
 BAK, Back At Keyboard
 BBFN, Bye Bye For Now
 BBIAB, Be Back In A Bit
 BBL, Be Back Later
 BBS, Be Back Soon
 BCNU, Be Seein' You
 BRB, Be Right Back
 CUL8R, See You Later
 CUL, See You Later
 Chat
 Chat acronym
 DIIK, Damned If I Know
 DYJHIW, Don't You Just Hate It When
 EG, Evil Grin
 F2F, Face-To-Face
 FDROTFL, Falling Down Rolling On The Floor Laughing
 FITB, Fill In The Blanks
 FOAF, Friend Of A Friend
 FOTCL, Falling Off The Chair Laughing
 FWIW, For What It's Worth
 FYA, For Your Amusement
 FYI, For Your Information
 GA, Go Ahead
 GBH, Great Big Hug
 GIWIST, Gee I Wish I'd Said That
 G, Grin
 HB, Hug Back
 HH, Ha Ha
 H, Hug
 ICOCBW, I Could Of Course Be Wrong
 IDK, I Don't Know
 IMHO, In My Humble Opinion
 IMO, In My Opinion
 IOW, In Other Words
 IWBNI, It Would Be Nice If
 JAM, Just A Minute
 JAS, Just A Second
 J/K, Just Kidding
 KB, Kiss Back
 KISS, Keep It Simple Stupid
 KOTC, Kiss On The Cheek
 K, Kiss
 L8R, Later
 LOL, Laughing Out Loud
 LTLYB, Love To Love You Baby
 MORF, Male OR Female
 MYOB, Mind Your Own Business
 NBD, No Big Deal
 NHOH, Never Heard Of Him/Her
 NP, No Problem
 NRN, No Reply Necessary
 OBTW, Oh By The Way
 OIC, Oh I See
 OTOH, On The Other Hand
 PITA, Pain In The Ass
 PMJI, Pardon My Jumping In
 RL, Real Life
 ROTFLMAO, Rolling On The Floor Laughing My Ass Off
 ROTFL, Rolling On The Floor Laughing
 SB, Smile Back
 SOL, Sh*t Outta Luck
 SUP, What's Up?
 SWEIN, So What Else Is New?
 SYL, See You Later
 S, Smile
 TAFN, That's All For Now
 TIA, Thanks In Advance
 TTBOMK, To The Best Of My Knowledge
 TTFN, Ta-Ta For Now
 TTUL, Talk To You Later
 TTYL, Talk To You Later
 TTYS, Talk To You Soon
 UOK?, Are You OK?
 VEG, Very Evil Grin
 VES, Very Evil Smile
 VWG, Very Wicked Grin
 VWS, Very Wicked Smile
 WG, Wicked Grin
 WTF, What The F**k
 WTHDTM, What The Hell Does That Mean?
 WTH, What The Hell
 W, Wink
 YAFIYGI, You Asked For It, You Got It