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When a girl is grinding on a and puts her hand behind her back into his pants delivering a blowjob.
Hey Katie i was totally dancing on this guy and have him a behind the back!
by noochinator March 27, 2011
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Oct 30 Word of the Day
A trick played on a fellow athlete where the open hand smacks the target's testicles with the knuckles in a sharp, wrist flicking motion.
"Dude, I sack tapped Brandon, and now he has the whole team trying to sack tap me"
by Chris M July 07, 2004
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