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1.
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
de Tony Cooper 31 août 2004
 
2.
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
de ass master 18 janvier 2003
 
3.
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.
de Lady Tiger 7 janvier 2003
 
4.
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
de don weezy 12 juillet 2006
 
5.
when you hit someone with your penis and leave a mushroom shaped mark
That girl got mushroom stamped!
de Dakota w. 10 juillet 2008
 
6.
The Slapping of an erect penis aginst a womens face or ass.
After cumming on her titties, i mushroom stamped her ass!!!
de WhiteRebel09 23 décembre 2007
 
7.
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!
de M Sul 12 mai 2003