In sports, the greasy butter one feels on the sweatband of a helmet that is used by multiple people. It's a positive indicator that the helmet has never been cleaned. Helmet butter is ubiquitouslying noticed when picking up a sports helmet, is very greasy to the touch, and usually makes one grimace until they can sanitize their hand. Helmet butter is not USDA approved, even though it's viscosity is measured in calories. The FDA has started clinical trials as to helmet butter's efficient properties for being a gag-reflex inducer, and is likely to get approval.
Coachs handing out helmets to participants often say, "yuck, my finger is covered in helmet butter!"
by Dr Drew, PhD October 13, 2016
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The top of a penis shaft. It resembles an equipment helmet thats used in sports to protect your head from injury.
Woman "My boyfriends pink helmet is so big, I almost chocked trying to suck it."

Man "I clubbed that stripper on the head so hard with my pink helmet, she went to the hospital with a concussion!"
by FernandoAl December 1, 2013
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1. some one who acts retarded
2. what the retard would wear if he bought the helmet
3. a mental case or total basket case so spasmatic that he or she may need to wear a helmet to protect themself from head injuries from their own lack of competence
4. NOT TOO SWIFT
helmet box HELMET BOX
Whats his problem
he tried to put on the box and i took it and put the helmet on for him hes not to swift thats why we call him HELMET BOX
by skyjack_fixer@yahoo.com November 2, 2007
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Person whos hair resembles that of a cat with a lime on its head. Who is very oblivious to most anything. Likes to push thier authority around and treat people like pond scum.
Dave: "I would like to take a vacation day for friday 2 months from now."

Imperial Helmet: "Mmmm.... Yeah.... I'm gonna have to go ahead and just deny that now. And were gonna have to have you come in and work saturday also for the next 2 months."
by chew-chew-nong-nong-head July 21, 2010
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Used to describe a person's extremely large teeth, referencing the potential problems experienced when giving a blowjob and 'rake' the helmet of the penis.
That bird had a right set of helmet rakers, I had to tell her to stop.
by RichieBigTits March 21, 2013
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When one, driven by resentment/hate/anger etc takes the decision to rub their penis head round the rim of target-person's drinking glass as act of revenge.
I fucking hate that bastard; when he leaves to go to the toilet, i'm Helmet rimming his fucking glass.
by silversausage October 8, 2010
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