Dipping the head of your penis into ink, and using the head as a stamp.
"Hey bro, did you see how wasted Steve was last night?"

"Yea! I gave him a mushroom stamp on his cheek!"
by Jeffonte July 04, 2017
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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
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A person who has been given or is assumed to have been given a multitude of mushroom stamps. Could be used as an insult or a term of endearment.
So you think you're better than me little miss mushroom stamp.
Hey little miss mushroom stamp you missed drinks last night
by sdmama April 09, 2017
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