This is when a guy hits a girl in the forehead with the tip of his penis.

Specifically, the bottom part of a circumcised penis looks like a mushroom head, so the male would tap the bottom tip of his dick on her forehead with his mushroom and thus stamping her forehead.

Typically performed on females that you feel are sluts to make them feel like a complete slut.
i hooked up with this slut so I mushroom stamped her, just to be an ass.
by john_doe_123 February 03, 2010

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the mark left on ones body when smacked with the head of a penis.
I smacked my dick on her forehead and left a mushroom stamp on her.
by kingtoocan August 29, 2009

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when a gay male slaps his penis on the forehead of another male, marking him as his sex slave with a mushroom-shaped mark.
During sex he slapped his penis on his partners face leaving a mushroom stamp.
by Skippy1970 July 23, 2012

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When you take your weiner and slap it on a girls a**.
"I gave Jessey a Mushroom Stamp to let her know who's boss!"
by lovedthetowels October 15, 2009

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a large mushroom shaped mark created by the effect of a dick-slap straight to a face or more specifically cheek and forehead region.
Freddy got pissed at his girlfriend. he then proceeded to give her a large mushroom stamp.
by yjedagrasil June 18, 2009

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to leave a mushrooom shape on a girls face after slapping her with your shlong
tori schmus got mushroom stamped by two guys at once.
by huegerecsion May 12, 2009

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The mark or bruise left after slapping a girl forcefully with your dick. (Usually after oral sexual intercourse)
Guy 1: Dude! Look at your girlfriend's face!!

Guy 2: Ohh yeah, thats nothing just mushroom stamped her last night. No biggy.

Guy 1: Holy fuck man! That had to hurt!

Guy 2: Yeah, just at first.

(Both laugh)
by MattDiver March 05, 2011

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