hammerhead

noun ! Definition from WordNet 3.1, Princeton University. More about hammerhead at Wordnik → Where our words come from →

1. A stupid person; these words are used to express a low opinion of someone's intelligence.
2. The striking part of a hammer.
3. Medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous.