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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To remove your retainers, usually in the Morning. Sometimes it's also done at night to get ready to consume snacks while watching movies. This frees the teeth and jaws up for cleansing. It releases microbes, allergens, viruses and bacteria that have built up on the inside and outside during the night. It does the same with the body itself. It prepares your for the day ahead.
Any last words before you decap?
No. I'm getting it over with now.
by arvinthsiva December 28, 2018
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1 ) To remove ones cape 2 ) To reveal someones true identity
The superhero's has been revealed at the decaping ceremony
by KittyKatNZ January 07, 2022
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Decap stars is an ironic enstars vine on insta by froggy_feels, it features any any enstars character thats under 17/18 making a orgasm face mostly, yuzuru,tori,mao and matoko
dude,everyone is probably gonna get fuked, you know there really 15/16 they migth look like there not, but they are

Dude is that decap stars?

Decap stars
by xx_jazsuki_xx September 17, 2019
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