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!"
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When you fist a girl and get your fist nice and deep, then picking her up off the bed with one arm you fist pump her whole body in the air
I Gave her a Jersey Shore Fist pump, lets just say she no longer has a uterus.
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Means to beat a beat if your dancing in a night club jamming basically
In a night club dancing means jersey shore fist pump when you pumping to the beat in the club