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A Jack Dempsey is a guy who beats off like he’s fighting a whole damn boxing match, throwing punches so hard he might knock out his next-door neighbor.
My cousin’s a Jack Dempsey. He jacks off so loud, the cat ran out of the house.
He called me a Jack Dempsey because I finished my sandwich in one bite and then went for seconds.
That guy’s a Jack Dempsey. He’s been jerking off for three hours and still got time to text his ex.