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The term Granny slapper is generally used to describe an old woman (Most commonly fat) Who is into making pornography with younger men. Granny slappers can be described as Skanky and/or slutty individuals for being notoriously dirty. This term can also be used to describe someone's Grandma as an insult.
"Bro, is that his your over there?"
"Yeah, why?"
"cause' she's a fucking granny slapper"
by Wayne king June 01, 2014
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