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1.
[!]
Denotes sarcasm. Quicker than writing /sarcasm. Helps when sarcasm doesn't come across on the internet. You can put ~ around the sarcastic phrase too.
Noob: FUK U FAGGOT!!! LULZZ IM SO MUCH C00LER THN ALL U MUTHERFUQERS!!!

You: OMG, you're so funny !]
by Teller of Untruths January 25, 2010
 
2.
[!]
Denotes sarcasm. At one time, it was often used in the comment section of MLIA (My Life Is Average), when commentators regularly wrote disparaging comments about non-average posts, and sometimes rewrote posts to make them more amusing.
OP: "Today, I drove my best friend home from school. When we got to a red light, we started having a dance party. After a minute, a car pulled up in the lane next to us and the man driving joined in with us. Easily made my day. MLIA."

Commentator 1: "Well, just bring out the damn dancing lobsters. !]"

Commentator 2: "Today, I drove my best friend home from school. When we got to a red light, we started stripping. After a minute, a car pulled up in the lane next to us and the man driving joined in with us. Easily made my day. MLIA. !]"

(Apologies, but the site formatting makes it impossible to display the term correctly.)
by sarcastic_girl April 10, 2013
 
3.
[!]
Cyber lingo for a huge grin without using a smiley.
P.S. I made this up so anyone else who uses it got it from me, bitches.
George : Omg, Bridget said yes!
Bob : Omfg you homo.
George : !
by Hanorexic May 15, 2007