Used in chats and conversations every day, "</sarcasm>" is used to denote sarcasm. In HTML programming, tages are ended with a "/", such as </b> for bold text. Usually one would say a sarcastic remark, and then use </sarcasm> to indicate that he has finished his sarcasm. It pwns your mom.
Yeah, I DIDN'T do you mom last night.
As well as a movie, an alias for THE ADMAN, god of all, and king of teh unmercy. biatch!
Dude, I hope backtothefuture reigns his neverending über-ness upon you, cause your pissing the sh*t out of me.