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.
by Ramboyantone March 8, 2007

by mushroomstamp1304 September 17, 2013

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
by Snarfley McFookenhagen December 23, 2006

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.
by lakedaimon@comcast.net November 24, 2006

by Fo T Wada February 28, 2008

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
I gave my girlfriend a mushroom stamp during a BJ
by OuttaSight OuttaMind December 28, 2011

by lovedthetowels October 15, 2009
