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Slapping bag refers to the act of sexual intercourse with an attractive female counterpart. The term comes from the act of ones ballsack (the bag) slapping against the female partners ass during rough sex.
Bro1: Yo did you slap some some bag last night?
Bro2: Yeah dude I was slapping bag with that hottie all night.
Bro1: Niceeeee.
by Gazman1 January 24, 2017
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A Slapping Bag is a sleeping bag that you and your girl can fit inside comfortably and still have room to play around.
Bro 1:Me and Jen's sister are going camping!
Bro 2: Sweet! Dont forget your Slapping Bag.
by The Great Dunnski December 29, 2009
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