The original definition from the late 1980's characterizes those late teen-age and early twenty-something males with a prematurely rising/receding hairline.
Dude, what happened to you last summer? You went from a forehead to a five-head.
Your hairline is receding...you look thirty.
An abnormally large forehead.
That Mongoloid has a fivehead fit for screening sneak previews.
a large forehead
that's not a forehead, that's a fivehead
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.
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
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.
When some one has an extremely large forehead.
Whoa, Meredith's forehead is so huge it's a fivehead!
A grossly immense forehead, capable of reflecting enough sunlight to blind someone, or play movies onto.