The mark or bruise left after slapping a girl forcefully with your dick. (Usually after oral sexual intercourse)
Guy 1: Dude! Look at your girlfriend's face!!

Guy 2: Ohh yeah, thats nothing just mushroom stamped her last night. No biggy.

Guy 1: Holy fuck man! That had to hurt!

Guy 2: Yeah, just at first.

(Both laugh)
by MattDiver March 6, 2011
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While having vaginal intercourse with a female who is currently going through her minstrel cycle, you remove your penis and violently smack it on her forehead. This action results in a red mushroom like stamp on the females forehead.
Craig Boggs is a true dogg! He was banging this chick last night and he gave her a bloody mushroom stamp! Doubt she ever calls him back.
by Ithemrwes November 25, 2015
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After fucking your chick (or dude) in the ass, you pull out your dick and slap her (or him) in the face thus giving them a shitty mushroom stamp hence the chocolate mushroom stamp.
My chick loves chocolate so I fucked her in the ass pulled out and smacked her in the forehead with my mushroom tip leaving a glorious looking chocolate mushroom stamp. I never had anal sex with her again :(
by Alan C Scott April 28, 2008
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the act of mushroom stamping the girl you are with right before you blow off your load. thus covering her face in your man juice.
i gave that girl a cream of mushroom stamp because she wouldn't shut up.
by treborekim January 27, 2007
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sending a photo of your hard penis to a friend, giving their phone a mushroom stamp, electronically.
-hey dude, sorry i can't make it to your party
electronic mushroom stamp
-damn you!
by Brosanne February 9, 2011
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when you tame a bitch with your flacid schlong, often using it in a whiplike fashion.

note: this works better when you have an inverse chode
Maria: well that was good sex.
Gustaf: just a minute baby
Maria: stop playin over there and clip my toenails like you always do
Gustaf: SHIZANN!
Maria: what what what@!
Gustaf: You love the RingMaster Mushroom Stamp don't you?
by Auz March 6, 2008
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When a male rubs his penis on black shoe polish and then presses or "smacks" an unsuspecting person, leaving the impression of a black mushroom.
"Ok guys, the first person to pass out tonight gets a black mushroom stamp!"
by BigEd2469 October 21, 2009
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