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Decap is short for decapitation. Used in an informal sense much like Decaf is short for decaffeinated coffee
BRO 1: Yo bro, how many decaps you done since joining ISIS?
BRO 2: Only two bro
BRO 1: Niiiiiiiice bro
by Oh hey bro! June 16, 2017
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On a message board, a thread or post regarding a topic that has already been posted by someone else. The word originated on the Golden Blab message board (on, where multiple people posted a story about a drunk driver than accidentally decapitated his friend who was sticking his head out the window. Now anytime someone posts a topic that has already been posted, it is referred to as a decap, and replies to the repeat post simply a :decap avatar that is on that particular message board.
"I think I'm going to start a thread about whether IT should allow home ownership of Golden Tee machines."

"Dude, please don't, that is a total decap."
by TL1969 June 03, 2009
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