SMS Lingo

[A]
AFAIK	As Far As I Know
AFK	Away From Keyboard
ASAP	As Soon As Possible
ASL	Age, Sex, Location
ATK	At The Keyboard
A3	Anytime, Anywhere, Anyplace
[B]
BAK	Back At Keyboard
BBL	Be Back Later
BBS	Be Back Soon
BF or B/F	Boyfriend
BRB	Be Right Back
BTW	By The Way
[C]
CU	See You
CUL8R	See You Later
CYA	See You
[F]
FOC	Free Of Charge
FYI	For Your Information
[G]
GR8	Great!
[I]
IC	I See
IMHO	In My Honest/Humble Opinion
IMO	In My Opinion
IOW	In Other Words
[J]
JK	Just Kidding
[L]
LMAO	Laugh My Ass Off
LOL	Laughing Out Loud
L8R	Later
[M]
M8	Mate
[O]
OIC	Oh I See
OMG	Oh My God
[R]
ROFL	Rolling On The Floor Laughing
ROFLOL	Rolling On The Floor Laughing Out Loud
ROTFLMAO	Rolling On The Floor Laughing My A** Off
[S]
SK8	Skate
[T]
THX	Thank You
[U]
U	You
U2	You Too
[W]
WRU	Where Are You
WTF	What The F***
WTG	Way To Go!

http://www.smsglossary.com/definitions.html