1 definition by jun0!

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
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