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A person who thinks they're the bomb and everyone should worship them. Their head is so big it blocks the sun. They’re always drunk and grinning like a fool. They spend all their money on fancy stuff but can't even afford a decent meal.
My cousin is a jack head. He thinks he's a rockstar, but he can't even pay rent.
She showed up to the party with a giant head and a bottle of cheap wine.
My dad is a jack head. He thinks he's the best at everything, even though he lost his job.