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2.
a person who always wears a hat/cap
Turtle from the show "Entourage" is a hathead
by rohan tharakan November 12, 2007
 
1.
When you put on a hat for a long period of time, and after taking it off, your hair takes the shape of the hat. Usually occurs when your hair is particularly greasy.
-After a game of golf, Malvin takes his cap off-

Oliver: Dude, you've got hat head, when was the last time you showered?
by jun0! November 23, 2008