A term used to describe someone with few or no brains or common sense, resulting from repeated beating of one's head against the wall. An antiquated term from mid-20th century.
Little Joey runs out into the street.. in front of a careening ice-cream truck. Dad yells, "Joey! You flathead! Get out of the street!!"
A complete moron in the coinchat of a certain web-based auction site.
the california fathead parrot does not actually understand what it says, nor does it have any true intelligence... just like its more famous relative, the african grey.
The California Fathead Parrot is a fucking shithead!