Top Definition
When the penis is in the semi-hard form, looking remarkably like a large conker on the end of a piece of string, and whilst walking or running the bell end swings and bounces between the thighs, particularly common for men who wear boxer shorts.
Noun - Helmwang
Verb - Helmwanging
I was running away from the library, having been caught quumfing, and i had a nasty case of helmwang which left me breathless!
by Carlos45 July 18, 2009

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