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1.
1) An exclamation that is said when something unfavorable or unpleasant occurs.

2) The opposite of a treat.
1) "Dude, I was about to score ass with that chick until her fat friend cockblocked me by saying they had to leave. What an anti-treat!"

2) "Oh man, I think I just crapped my pants. Anti-treat!"
by Gator Dave June 13, 2007