29
When you hold back your cock and let it go to hit someone in the forehead,thus leaving a mushroom stamp
Back off before I hit you with this mushroom stamp

Sorry about the mushroom stamp, hope your dad doesn't see it
by BMF Bradly Michele Farts September 14, 2016
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30
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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31
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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