Definition of "fathead" in English

noun

1. (derogatory) An idiot; a fool.

   • You fathead! You forgot to put the milk in the fridge and now it's spoiled!

2. A cyprinid fish of the Mississippi valley, Pimephales promelas, the black-headed minnow.

3. A labroid food fish of California; the California sheephead. Semicossyphus pulcher.

4. A blobfish, Psychrolutes microporos

5. Any of several species of fish of the genus Cubiceps