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!"
Ryan: "Hell yeahh! That girl loved it when I was Jersey Shore Fisting her!"
by Undeader25 October 27, 2010
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
by Jizzleman34 December 20, 2009
by BaddestQueen018 August 03, 2017