Top Definition
Uncomfortable tingling sensation in the penis/scrotum following over-enthusiastic use of a menthol-based shower gel product. The closest feeling to menstruation that men can experience.
Tom: Mate, my balls are on fire over here.

Greg: You used my shower gel? How's it feel to menthstruate for the first time?

Tom: It feels like my balls are on fire.
by SMoorhen February 19, 2014
6 Words related to Menthstruate

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