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1.
To kill something (a joke or such) greatly, and kill it so bad that no one ever sees or uses it again (as in a reference to the fact that John Wayne Gacy Jr. killed 33 people and buried them in his crawlspace).
Guy 1: What's up?
Guy 2: (pathetically) Wazzup!?
Guy 1: Dude, why did you have to Gacy it?
Guy 2: (hangs head in shame)
by Pogo the Clown July 18, 2009
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