I’m attempting to compile a list of commonly used acronym over the internet in non-alphabetical order. You may have already heard most of them, hopefully this entry will teach you new short forms.
Do let me know if I missed out any!

FML: F**k My Life. Typically used when people felt they got into shit
FTW: Last time known as F**k the World, but now more commonly used as For The Win to describe enthusiasm
TBH: To Be Honest
BTH: Buay Ta Han. Singaporean’s way of saying can’t stand it or can’t tolerate it
/o\ imagine “o” as the person’s head and the slashes as the arms.. kinda like a pull hair emoticon
\o/ then of course there’s the hurray emoticon
Woot: originated from an online game. people use to say “Wow, found loot”, so they cut it short and it is now commonly known as w00t!
GG: Good Game. Often used while gaming with other human competitors. Usually used nearing the end of the game when the winner is almost decided.
HF: Have Fun
GL: Good Luck
TC: Take Care
TTYL: Talk To You Later
BTW: By The Way
WTH: What The Hell
WTF: What The F**k
OTW: On The Way
_|_ Symbolizes pointing the middle finger at someone. Doesn’t matter it is right or left hand.
XOXO: is not eXtensible Open XHTML Outlines. Too techie for humans to understand. It actually means Hugs and Kisses. Don’t ask me how they derive it.
<3 It’s a heart/love shape! Try it on Facebook.
</3 Broken hearted =(
TIA: Thanks In Advance
CMI: Cannot Make It
ROFL: Rolling On the Floor Laughing
LOL: Laugh Out Loud
XD: Just another stupid laughing face

IRL: In Real Life
Sexting: Texting/SMS-ing with sexual connotation in the content
U missed out ‘LMAO’. I often see people using it. But! I dunno what the heck it means. Maybe this can be your homework? Hahaha!
By: jasminecsy on July 7, 2010
at 4:19 pm
LMAO = Laugh My Ass Off!
TTM = To The Max
Hahhaha! Hope it helps Jas!
By: Keith T. on July 7, 2010
at 11:30 pm