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A jackhole is a guy who acts like he's the king of the world but is actually just a loud, obnoxious idiot who thinks everyone else is beneath him.
My cousin is a jackhole. He yells at the pizza delivery guy like he owes him money.
My boss is a jackhole. He screams at the printer like it did something wrong.
My brother is a jackhole. He calls me a jackhole just because I won a game.