Fatheads

noun

1. 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