Top Definition
When a guy jacks off or (masturbates) too much he tends to develop a rash on the penis that can be very painfull.

a better way to describe it would be a mastur rash
"I like to use lube when i beat my meat, if i dont i'll get a mastur rash"
by cheeze kush 420 September 25, 2009
5 Words related to mastur rash

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