mushroom stamp 

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

mushroom stamp by ass master January 18, 2003

mushroom stamp 

when you hit someone with your penis and leave a mushroom shaped mark

That girl got mushroom stamped!

mushroom stamp by Dakota w. June 26, 2008

Mushroom Stamp 

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.

Mushroom Stamp by Lady Tiger January 7, 2003

mushroom stamp 

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

mushroom stamp by Tony Cooper August 31, 2004

Mushroom Stamp 

The Slapping of an erect penis aginst a womens face or ass.

After cumming on her titties, i mushroom stamped her ass!!!

Mushroom Stamp by WhiteRebel09 January 14, 2008

Mushroom stamp 

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

Mushroom stamp by don weezy July 12, 2006

Mushroom Stamp 

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.

Mushroom Stamp by Rationalize October 3, 2011