Some who lacks knowledge in the most obvious things.
"I thought that butterface mean that her face looked like butter"
Geez, you're such a helmethead.
by #1 helmet November 04, 2010
A mental handicapped person (or window licker ). They wear bright luminous crash helmets so they are easily recognisable and do not stray too far from their spaz wagon. Helmet also helps in event of multiple spasms, fits or collisions with lamp posts.
"Hey Johnny, look at those helmet heads chasing the ducks."
by mtotheo November 07, 2003
When soldiers out at war have nothing better to do.
Hey, if you promise not to tell my wife, I'll give you nice helmet head!
by browntrousers February 21, 2009
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