Derives from the saying 'I'd tap that'. But in this instant the said individual is so unappealing/unattractive. That you would rather shoot them once, then once again just to be sure. As you would with a Zombie
Guy 1 - Dude look at that Hooker.

Guy 2 - Damn she is fugly.

Guy 1 - Yeah I'd double tap that.
by psycofreek69 July 8, 2012
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