The rash, similar to razor burn, a woman gets after a guy with a scruffy face goes down on her.
Man, my boyfriend went down on me last night and left me with a stash rash.

I had to go commando today, my stash rash is flaring.
by BoilerKate June 16, 2010
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A rash obtained by two men with mustaches aggressively making out.
Pete and Lucas both got stash rash after class.
by 500ToothDinasar March 2, 2023
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This is a crust around the mustache / beard area caused by dried on snatch (aka vagina) secretions.
Our co-worker came to work again today with a bad case of rash stash.
by Craig Werner April 15, 2008
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