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Equivalent to cock-blocking yourself.

Poonacide is considered to be any words or actions that that are an immediate turn-off to the female of interest, thereby killing any chances of sexual contact.

Comes from the root words POON and SUICIDE.
Guy 1: "Dude I totally had that chick until I started talking about my ex."

Guy 2: "Yeah you definitely committed poonacide there bro. Might wanna steer clear of that subject next time."
by famousKid February 22, 2009
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