Definition of Hammerhead

Noun: hammerhead 'ha-mur,hed

A stupid person; used to express a low opinion of someone's intelligence
- dunce, dunderhead, numskull, blockhead, bonehead, lunkhead [N. Amer], knucklehead, loggerhead [archaic], muttonhead, dumbass [N. Amer], pea brain, chowderhead [N. Amer], lamebrain, numbskull, bubblehead, twonk [Brit], lunk [N. Amer]
The striking part of a hammer
Medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous
- hammerhead shark