mushroom stomp 

a person who is usually sleeping, and another person takes their penis and smacks it across their (the person who is sleeping) face to wake them up and the slap by the penis wakes the person up, usually the person ends up with a red mark on his or her's face from the slap

Hey man tyler is passed out what should we do to him? and the friend replies: Give him a mushroom stomp but aim for the top lip between the nose and the lip!

mushroom stomp by Nicky Jim January 18, 2009

Mushroom Stampede 

The act of being continuosly mushroom stamped to the facial area with less than 2 second intervals between stamping.

Taylor, Savannah's face looks like shit from that mushroom stampede last night.

Mushroom Stampede by Turdnuggetbluntman February 9, 2010

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.

A mushroom stamp by Andrew O. Ben S. TC M. October 7, 2005

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 Stomping 

An act of mushroom stamping, but with a giant penis, usually to a person being a complete douche. This is appropriately done by slapping said douche in the face with said penis. If correct technique is applied, the stompee will have a giant, dick-shaped imprint on his face.

"Justin was being a huge dick, so Luke mushroom stomped him with HIS huge dick."

mushroom stomping

Mushroom Stomping by YouCanSuckABigOne March 7, 2012

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