Abrassions on a penis caused by either dry humping or dancing too hard with a boner.
Me and this chick danced all night, bitch gave me mushroom burn.
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When one drunk dude passes out at high noon with his cock on a girls cheek in the middle of the afternoon allowing for the sun to burn them. Once sobering up, the woman realizes that she has a mushroom burn on her cheek when looking at a reflection in a mirror.
Tom: Bro, did aunt Sally have a mushroom burn at the family gathering this evening??
Bill: She definitely did, but so did her daughter...
Tom: They got a new pool cleaner, didn't they?
Bill: Yes, yes they did.