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A guy who acts like he’s the king of the universe but doesn’t even have the brains to back it up. You call him Jack-Ass Jones when he’s being especially loud, dumb, and full of himself.
"Jack-Ass Jones just cut me off in traffic and yelled at my dog."
"At the party, Jack-Ass Jones tried to impress everyone by telling a joke no one got."
My teacher called him Jack-Ass Jones after he threw a pencil at the principal.