To slap a female in the forehead with intent to leave a mark with your cock
by Lady Tiger January 7, 2003
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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
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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!!!
by WhiteRebel09 December 24, 2007
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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
by don weezy July 12, 2006
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An imaginary outline left by slapping one’s magnum dong against the face of another.
If you gave Lady Gaga a mushroom stamp, you'd be using your dong to poker face.
by Rationalize October 3, 2011
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Verb: The act of pressing one's penis to a person's face, leaving a mushroom-shaped mark, with semen.

Noun: The mark left from being 'mushroom stamped'
v: Dave Mushroom Stamped Debra, after whacking off on her curtains.

n: Debra went to work today, not knowing she had a mushroom stamp on her forhead.
by Taichi January 26, 2005
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