short for "helmet" helm is another word used for the head of the male penis. The helm if covered in foreskin, can cause smeg and nob cheese to form in sometimes copius amounts. if unsheethed the helm normally remains clean and can sometimes be pleasant to the touch.
"errrgh tom your lemon helm is covered in cheese"
"mmmm mr buntrock your unsheethed helm tastes great"
by gooch merchant May 29, 2006
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Adjective meaning to have sexual intercourse. Derived from helm-et (another vulgarism for the penis), helm, i.e. the act of using one’s helm-et or helm-ing, and the idiom to be at the helm - a position of leadership or control taken from nautical terms for the steering wheel of a vessel (from Old English helma, from Proto-Germanic khelman = "handle") particularly attributable to sexual intercourse “doggy style”
"Did you helm her last night?"
"What did you do last night?, I was at the helm"
by Neil99 March 14, 2006
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(n.), an english term used to describe one who has an overwhelming flow of chest hair. (v.) the act of growing an overwhelming flow of chest hair.
(n.) Look at that guy, his chest is so hairy. He is a Helm.
(v.) His chest is hairy because he starting helming at such a young age.
by tim May 27, 2004
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(colloquial noun - abbreviated from "helmet") : A begrudged friend who is tolerated, of disreputable or unreliable character.
"We was out on the tiles last night, he really did my head in last night, he's my bro n all, but he was cock blocking me all night - acting like such a helms."

"Alright helms?! How's it going"

Etc
by Nath Dogg November 29, 2013
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Short form of helmet, the bell end.
Oh Mr Wolf, what a big helm you've got.
All the better to shaft you with.
by Ian Chode April 3, 2003
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Contraction of 'he-elm.' The male elm tree.
ant: she-elm
Look at the nuts on that- its a mighty helm.
by robcraine March 15, 2004
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the glans(tip) of one's penis
I think I just chaffed my helm on my zipper.
by The Return of Light Joker January 15, 2008
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