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A Jabobhead is a knobhead so bad even other knobheads would rather die than be related to them.
My cousin is a Jabobhead. He tried to rob a donut shop and got caught by the donut police.
My boss called me a Jabobhead after I spilled coffee on his suit. He now wears a donut-shaped hat.
My neighbor is a Jabobhead. He tried to pet a raccoon and got bit. Now he talks to raccoons.