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1) The act of constantly abusing your genitals to pleasurable thoughts
2) Slang for playing the game of Hacky Sack
1) "Jeff's kinda weird, he says that instead of masturbating, he usually just smacks the sack."
2) Man 1: Hey what are you doing?

Man 2: Nothin' much just smackin' the sack, you want in?

Man 1: Sure!
by TheCyclopsMan June 11, 2011
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