Like the similar definition on this page, the act involves inserting one's head into the particular orifice. The original example that I've seen, and most others have also seen, is a video of a bald man putting his head (up to his ears) into a woman's vagina.
Did you see that video where that guy put his head in that chick's pussy? That's gotta be one seriously loose hole for helmeting.
by LazinessPrevails September 17, 2009
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A window-licking, raisin-loving , mcqueenie wearing moron who wears a state-appointed bike helmet that probably has a rubber Mohawk.
That helmeteer rides the short-bus.
by Tard tamer 3000 February 20, 2017
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1. the top of a man's penis, or a hermaphodite's penis I guess as well. Also reffered to as a purple helmet.
2. A condom, as worn on the head of your penis, perhaps a more accurate term.
3. A kevlar, or plastic covering for your less important head, as worn while riding a motorcycle or visiting a construction site. Or oddly, enough, while exploring actual caverns. See spelunking.
Timmy, what have I told you about playing indoor sports without a helmet? Naughty boy!
by JamiSpoon May 24, 2003
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To play the game of Helmet means to touch everything with the tip of your penis. i.e. - to go up to your friend's toothbrush and rub your penis tip on it. Gross? Yes. Amusing? Not really.
by don_jaun_dela_nooch_cw August 25, 2003
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an individual who is in need of a helmet, for their mental capacity is so small that thoughts floating around can hurt their head, causing their brow to furrow. a slight tilting of the head is also common.
that guy over there is such a helmet. he told me that he would rather have the weekend in the middle of the week, because it would be nice to have a break.
by streetspirit January 23, 2003
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To get so drunk that the only course of action is to strap the victim into a helmet so that he or she does not hurt themselves. Like, say if they had to go home on their own or they are constantly bumping into things.

Knee/elbow pads optional.
"fuckin hell Tina's sooooo drunk"
"i better go up to my room and get the gear... she's helmeted"
by rw17 January 5, 2007
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I was licking her mot and she was smoking me helmet.
by Bear January 23, 2003
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