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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! "
Helmet by dictomoondag March 30, 2011
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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!"
helmet by Yorko February 26, 2008
Another way to call someone stupid.
Person #1: See that guy who ran into that door?

Person #2: Yea what a helmet
Helmet by Mista Foldgers May 26, 2009
oral stimulation of the penis
Yo' broad gives some mean helmet.
helmet by Joseph Momma November 7, 2003
hel·met
   hell-meht noun
A means to describe someone's intelligence referring to a mentally unstable person. One who wears a helmet to protect them from injuring themselves because they cannot function for on their own. Can also be known as slang.
1)

A-"I heard Greg got a 39% on that test last class"
B-"What a helmet!"

2)
A-"Hey you f***ing helmet"
Helmet by Ayy Fawn September 29, 2011
used in da dirty south west of da uk, anova word for blow or weed.
mayne u got ne helmet on you this niga needs a blow!
helmet by G from B April 17, 2008
a descriptive word used for a certain marijuana whos effects are so powerful that when after smoking an actual protective helmet is required to perform routine activities so one does not seriously injure his or her self
"Hey Willie would you like to go smoke this helmet with me?"

"Yo son hit this hemlmet."
helmet by double digits 70 March 31, 2009