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, 2010
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A nice pair of tits that are big enough to slap around.
JP, "Joanie is coming over tonight."
Friend, "How big are those SLAP BAGS?!?!?!?"
JP, "Double D's!!!!"
Friend, "sand-dollar nips?"
JP, "Nope!"
Friend, "I'm so jealous."
by Slipinsider September 4, 2010
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