A bruise, in the shape of a mushroom, obtained by being slapped with a large penis or penis-like object.
"Dude, I can't believe you goin' out with the new girl from accounting!"
"I'm gonna mushroom-bruise her ass, just for you. Just watch -- she won't be sittin' straight for a week."
"I'm gonna mushroom-bruise her ass, just for you. Just watch -- she won't be sittin' straight for a week."
by Dharma Midget September 7, 2016

A phallic contusion in the shape of a mushroom inflicted by a forceful blow of a penis to one's body.
by TubesteakNyourI May 16, 2003

by johnny walker November 29, 2003

by German Gheppetto June 22, 2006

by JeepGurl November 3, 2010

by Stinko Man February 4, 2003

The act of pulling out your penis while being blown, and systematically slapping your partner's face with it, thus leaving a purplish bruise resembling the tip of you penis (a mushroom).
by Flantari September 30, 2006
