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The act of inserting one's fist into another one's anus or vagina, and fist pumping like Pauly D, Mike, Vinny, or Ron off of MTV's hit reality show "Jersey Shore".
Jack: "You have fun last night?"
Ryan: "Hell yeahh! That girl loved it when I was Jersey Shore Fisting her!"
by Undeader25 October 26, 2010
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