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A wrestling jobber. A dumbass who talks too much but can't back it up. A loser who gets beat up and still thinks they're cool.
My cousin is a jabroni. He yells at people and then gets kicked in the face.
At school, that kid called me a jabroni because I didn't know the answer.
He's a jabroni. He talks about being strong, but he can't even lift a bag of groceries.