The tip of a circumsises penis. More specifically, any male individual who behaves like one, especially one who acts in an aggressive manner.

"John's always flexing his muscles and trying to start fights. The guy's a real helmet."
by Atlas2 September 17, 2008
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an often unappreciated and overlooked alternative rock band from the early to mid 1990s.
Helmet, sure put on a great show at the club last night!
by gus winslow August 13, 2003
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n. A parasite. Specifically a college guy you don't know who comes to your party early with lots of his helmet friends. They bring enormous cups for beer drinking and knock out half of the keg before anyone else shows up. They are nitwits. When women arrive, they cock block you either by talking directly to the women and making them think they are your friends, thus branding you a helmet, or acting like such idiots that they ruin the party and your rep, or by kicking the keg just as the women show up. Then they leave without pitching in for the next one.

Root: suggested root is the helmets football players wear; helmets show up at a party and behave much like a football team made up of losers and dorks.
Look at this f*cking helmet puking on my carpet. His beer is warm and flat because his cup is too big. He tried to rape my girlfriend in the bathroom. He broke the coffee table trying to dance on it. Now everybody is leaving. F*cking helmet.
by Chief Bootysmackah June 1, 2004
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A sexual practice, most likely between two men, in which the goal is for the one to insert his actual head into the anus of the other. This is accomplished by the receiver having his spincter muscle severed by a knife, so his ass cheeks more or less flap apart. The giver then lubes up his shaven head and goes to town. It is uncertain whether this practice is supposed to be (more) pleasurable for the giver, or the receiver.
Raoul had to go to the doctor's to have his butt cheeks sewn back together after he was finished helmeting.
by Big D June 16, 2003
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A name given to a circumcised guy's penis. Or simply just a name given to a guy who has a circumcised penis. Used as the opposite of sock, i.e. an uncircumcised guy's penis.

This of course came about due to the obvious visual differences, i.e. a circumcised penis could appear to be wearing a helmet, whereas the extra skin on an uncircumcised penis kinda looks like a sock.
Curious Dude: "Hey man, question. Are you a helmet or a sock?"

Jewish Dude: "Holy crap, man, for the last time: I'm Jewish! Think about it."

Curious/Confused Dude: "What the hell, man? What's Judaism got to do with your package?"

Exasperated/Jewish Dude: "Oy!"
by Yorko February 26, 2008
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oral stimulation of the penis
Yo' broad gives some mean helmet.
by Joseph Momma November 8, 2003
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