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
by ass master January 19, 2003
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
by Tony Cooper September 1, 2004
When a man slaps a woman on some part of her body with his member.
Her "what are you doing?"
Him "Giving you a mushroom stamp, bitch!"
by mushroom stamper October 10, 2007
Getting hit with the shaft of a male leaving an impression on ones forehead.
Shane Graves enjoys mushroom stamping Joey Morrow.
by PArtsBoyLOversXoXoXoXo May 30, 2012
The stamp usualy worn by hookers after a rough night.
Ohhhhh girl, I gotta wash this mushroom stamp off my cheek. But I made fity bucks.
by {E-Z}Ryda February 8, 2003