A forehead so incredibaly large it can be classified by the next number up.
"That guys got a hugre forehead!"

"Yeah dudes got a five-head
by Cheese and Lohsl February 02, 2005
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A very large forehead - 25% larger in fact.
The sun is just beating down on my five head today.

Maybe you should get some Rogaine next time you're getting your Viagara old man.
by Bo Dizzle May 05, 2004
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A "four-head" is when you can only fit four fingers between your eyebrows and your hairline. You have a fivehead if you have such an abnormally large forehead that you can fit all five fingers.
That guy grows his hair into his eyes so you can't see his gigantic fivehead.
by Slim Brady November 30, 2005
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its too big to be a four head so we have to call it a five head
marryanne, aneta, krystall's heads are so big that they have five heads. V-4 = Vsuck
by scott schroder May 13, 2003
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