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A mushroom stamp 

when a male slaps his penis off the forehead of another individual, leaving a mushroom-shaped mark.
Jen was steppin out of line, so i gave her a mushroom stamp.

mushroom stamping 

The act of pressing the head of ones penis into another persons forehead or other facial area.
As soon as Ben passed out, Jer proceeded to mushroom stamp him to no avail.
mushroom stamping by Snapdragon August 8, 2003

mushroom stamped 

Pressing ones penis on the forehead of an unfortunate individual.
Greg fell asleep and was mushroom stamped.
mushroom stamped by n/a March 30, 2005

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