1 definition by the nig thumper

Top Definition
When someone jumps behind you and scares the crap out of you in a most vulgar manner, mostly thrusting their crotch at your behind. The attacker usually screams the words “Surprise Butt Sex”.
Girl - Holy crap Liz, Mike just sneak fucked me.
by the nig thumper September 30, 2011

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