When a a dude and chick have anal sex and when the guy pulls out, poop is on his dick and he slaps the girl on the cheek with his dick removing all of the poop on his dick and leaving it on her face in the shape of a mushroom.
Jamie: "Dude, David's mushroom stamps hurt!! He hits you so hard with his cock!"

Vanessa: "I like to take a Mushroom Stamp on the tounge."
by Dyaln (triip) Herzberg January 10, 2009
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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
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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
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The act of forcing someone to kneel down (have them stand if they are much shorter than you), then removing all your clothes, and getting to a good distance. Once you have achieved the desired distance, you then run and jump, swinging your hips causing the head of your penis to slap them in the face, leaving a bright red imprint shaped like a mushroom.

Please exercise extreme caution when performing the Flying Mushroom Stamp. Serious injury may (and often will) occur.
I performed the Flying Mushroom Stamp on that bitch, dawg!
by Kaj Darkwind May 15, 2010
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Generally performed by cook or some sort backline employee-type. For whatever reasons,(i.e. plate sent back, difficult diner or just don't like someone,) the cook removes his cyclops stick from his britches and strikes a portion of the meal and sends it out to be ate.
"That guy was such an ass, so I gave his mashed potatoes my mushroom stamp of approval."
by Marcoleptic June 22, 2006
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NOTE: this move requires a flacid penis. while dangling your dong in front of a woman in an attempt to 'woo' her, you grab the base of your member and swing it in a counterclockwise ninja motion smacking her flush on either cheeck leaving a welt resembling a purple mushroom. in germany this is seen as a sign of affection...in tennessee it will get you killed.
i wanted sandi to know that i was into her...so i gave her a purple mushroom stamp. in return she hooked me up with an award winning clark bar
by DJ KNUCKLES March 8, 2005
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While in the act of doing a mushroom stamp, you jizz(explode) at the same time.
Do the exploding mushroom stamp to your mother
by kuter punch February 28, 2009
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