The first meaning is another name for the head of the penis. Due to the similarity of shape and positioning on the end of the penis.

However you can also call someone a 'helmet'. You would use this if they are acting like a total idiot by saying or doing ridiculous things.
"we fucked all night, and now my helmet is red raw!"

"I'm sick of him always pulling his balls out in front of everyone when he's drunk- he acts like a total helmet!"
by Eminence of vulgarity June 08, 2012
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A helmet is British slang word that's used to describe an individual who's being stupid or has completely no reputation to join a conversation or add their opinion.
Gary: So yeah I was walking down the street yeah and this stunn--
Oliver: Yeah but I don't care.
Gary: Who the fuck is this helmet? Jog on.
by Lawterian August 25, 2017
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A helmet is someone who tries too hard and thinks they are proper top like they're on par with the head of a penis. Ironically however they are more like a skid mark on an old mans pair of gruds
Helmet: I ran 10k in 30mins today.
You: save it you fucking prick I'll bang you out if you carry on like that you helmet
by Lee The King July 22, 2017
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One of the most original hard rock/heavy metal bands to rise up from the United States underground; The original and most prominent lineup featuring Page Hamilton on guitar and vocals, Henry Bogdan on bass, John Stanier on drums, and various background guitarists. Their original sound was based around heavy guitar distortion with droning riffs, outrageous guitar shredding and solos (influenced by bands such as Sonic Youth, Void and Killing Joke as well as many jazz musicians), loud chuggy bass lines, heavy snare drumming, and background guitars to create a "wall of noise" sound.

In 1992 they blasted into the mainstream with their second album "Meantime", which featured their most known song "Unsung". The band also released "Give It" and "In the Meantime" as singles, but both songs flopped in sales and didn't receive as much attention as "Unsung". Helmet's two albums "Strap It On" and "Meantime" were both so groundbreaking that it spawned many watered down imitator bands that ripped from Helmet's sound, the most prominent three being Korn, Deftones and Tool. This move infuriated and disgusted the band, giving them the desire to do something much more experimental to alienate themselves from their imitators.

In 1994, Helmet released their third album "Betty"; a much more melodic album which owed more to bluesy and jazzy heavy metal, which featured the songs "Wilma's Rainbow" and "Milquetoast", both of which became minor hits on modern rock radio. Helmet have gone on to release 3 more albums and still remain a favorite of Modern rock, Hard rock and Heavy metal fans today.
HELMET are a very great, but HIGHLY underrated band.
by not found [Error 404] May 27, 2007
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A derivative of "idiot" or "pratt", Helmet fuses the semantics of the end of a man's penis and the un-cool nature of the common bicycle helmet. It is most commonly used in a jovial manner when laughing at a friend or aqcuaintance with another friend.

It can also be used to describe a person who is not a friend, who has committed an action upon those in the circle of friends which had malicious or vengeful intent, but ended up being a source of laughter to those inside of the circle of friends.
" You heard that Shaun is away this weekend seeing that minger from Blackpool ?! "

" Haha is he?! What a Helmet! "

" Did you see that lad come to push me away from that girl he was trying to pull and then slipped on the dancefloor?! "

" Yeh! What a Helmet! "
by dictomoondag March 14, 2011
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A fairly decent Groove metal band started in the New York City underground music scene in 1989. Fronted by lead guitarist and vocalist Page Hamilton. Original members include Henry Bogdan on bass, John Stanier on drums, and Peter Mengede on rhythm guitar. Broke up in 1998 but reformed in 2003 with new members.

Well, yes...I like the original Helmet; but not the watered down, newly reformed so called "Helmet" that plays crappy Alternative rock instead of Heavy metal.
by not found [Error 404] June 06, 2007
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A Helmet or a Helm is a total 100% dumbass who has no idea what he is talking about or doing
Dude WTF are you doing? You are such a Helmet
by hartferd August 08, 2010
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