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

Mushroom Stampede 

During a gang bang on one female, all males get onto one side of the room with penises erect, the gazelle gets down on her knees on the opposing side. Then all of the males high-five and sprint at the woman and stamp her face with their shafts.

Friend 1:"Dude, last night we pulled a mushroom stampede on Mr. John's wife!"
Friend 2:"Where was my invite?"

Mushroom Stampede by DirtyM@ February 18, 2017

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 Stamped 

The act of getting a dong slapped on your head

Joe was so drunk I mushroom stmaped his ass

Mushroom Stamped by Anonymous March 16, 2003