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

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?"