Top Definition
an urban slang of the word "Hymen" commonly used among teenagers in the west coast and cool whips in their early 20's

"Hyemun" or "Hymen" is a fold of mucous membrane partly closing the external orifice of the vagina in a virgin.
Two drunk dudes at a bar...
Bro 1: "Hey man! Did you break her hyemun?"
Bro 2: "Yeah dawg! I popped her cherry last night."
Bro 1: "Wordd."
by MK Berry March 09, 2010

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