look up any word, like blumpkin:
 
15.
when a gay male slaps his penis on the forehead of another male, marking him as his sex slave with a mushroom-shaped mark.
During sex he slapped his penis on his partners face leaving a mushroom stamp.
by Skippy1970 July 23, 2012
 
16.
Using the head of a penis and smacking someone in the face leaving behind a mark in the skin that looks like a mushroom.
My friend fell asleep so I gave him a mushroom stamp;
I gave my girlfriend a mushroom stamp during a BJ
by OuttaSight OuttaMind December 26, 2011
 
17.
When you take your weiner and slap it on a girls a**.
"I gave Jessey a Mushroom Stamp to let her know who's boss!"
by lovedthetowels October 15, 2009
 
18.
the mark left on ones body when smacked with the head of a penis.
I smacked my dick on her forehead and left a mushroom stamp on her.
by kingtoocan August 29, 2009
 
19.
a large mushroom shaped mark created by the effect of a dick-slap straight to a face or more specifically cheek and forehead region.
Freddy got pissed at his girlfriend. he then proceeded to give her a large mushroom stamp.
by yjedagrasil June 18, 2009
 
20.
to leave a mushrooom shape on a girls face after slapping her with your shlong
tori schmus got mushroom stamped by two guys at once.
by huegerecsion May 12, 2009
 
21.
The mark or bruise left after slapping a girl forcefully with your dick. (Usually after oral sexual intercourse)
Guy 1: Dude! Look at your girlfriend's face!!

Guy 2: Ohh yeah, thats nothing just mushroom stamped her last night. No biggy.

Guy 1: Holy fuck man! That had to hurt!

Guy 2: Yeah, just at first.

(Both laugh)
by MattDiver March 05, 2011