Top Definition
Verb: An act occurring after anal intercourse, where the man removes his "Mushroom"-headed warrior from his female participant's rectum or balloon knot, and proceeds to take his poo-stained man-pole, and slaps his partner in the face or forehead (whatever preferred), leaving a mark (or stamp) in the shape of the tip of the distributor's dong (mushroom-esque);
When I was finished penetrating her poop shoot, I used her rectal leftovers to give her a Mushrrom Stamp
po Tony Cooper Август 31, 2004

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slapping a penis on top of someones forehead or on a car window
we gotta get out of here i just mushroom stamped that cops car

that guy parked so close to me i mushroom stamped his window
po ass master Јануар 18, 2003

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To slap a female in the forehead with intent to leave a mark with your cock
The bitch was pissing me off, so i Mushroom Stamped her.
po Lady Tiger Јануар 7, 2003

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To leave an impression of ones penis on another persons skin(Face preferably). 2. To Dick slap.(really hard)
The hoe was back talkin so i mushroom stamped her across the forehead
po don weezy Јул 12, 2006

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when you hit someone with your penis and leave a mushroom shaped mark
That girl got mushroom stamped!
po Dakota w. Јул 10, 2008

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The Slapping of an erect penis aginst a womens face or ass.
After cumming on her titties, i mushroom stamped her ass!!!
po WhiteRebel09 Децембар 23, 2007

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To slap someone with your penis in the face leaving a mushroom shaped red mark on the victims face.
That girl was so drunk when I gave her a mushroomstamp it knocked her out cold!
po M Sul Мај 12, 2003

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