mushroom stamp 

This is when a guy hits a girl in the forehead with the tip of his penis.

Specifically, the bottom part of a circumcised penis looks like a mushroom head, so the male would tap the bottom tip of his dick on her forehead with his mushroom and thus stamping her forehead.

Typically performed on females that you feel are sluts to make them feel like a complete slut.

i hooked up with this slut so I mushroom stamped her, just to be an ass.

mushroom stamp by john_doe_123 February 3, 2010

mushroom stamp 

the mark left when one hits their partner in the face with their dick after thuroughly buttsexing them and having a poop covered dipstick, leaving a mushroom shaped mark on their head from the remaining fecal matter.

the AQ krew gangbanged wade and they all mushroom stamped him afterwards

mushroom stamp by Ramboyantone March 8, 2007

mushroom stamp 

To slap a persons forehead with a penis

Person1: "I'm Mexican"

KKK: "Need a mushroom stamp"
Mexican: "Me no mushroom stamp"

mushroom stamp by mushroomstamp1304 September 17, 2013

mushroom stamp 

the act of pushing the tip of your own cock into your anus - just slightly - thereby inking your tip - and then imprinting the mushroom image onto said victim

If you don't get off of my lawn, I'm gonna mushroom stamp all you little bastards!

mushroom stamp by Snarfley McFookenhagen December 23, 2006

mushroom stamp 

A variation of teabagging where the bagger first marinates his undercarriage in a viscous substance such as barbeque sauce or ketchup. The goal is to leave a mushroom shaped mark on the victim.

After a quick trip to the condiment counter you are all set to deliver a mushroom stamp

mushroom stamp by [e-mail] November 24, 2006

mushroom stamp 

Placing the head of your Johnson on an unsuspecting person.

I waited till Gina passed out, then I mushroom stamped that bitvh.

mushroom stamp by Fo T Wada February 28, 2008

Mushroom Stamp 

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

Mushroom Stamp by OuttaSight OuttaMind December 28, 2011