To slap someone across the face with one's penis.
Those dudes are always mushroom slapping each other.
by Nate Fergus February 02, 2003
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if someone happens to be getting fresh with you, mushroom slap them. This means pulling out your jimmy and making solid contact with their facial region.
C-dav definitely mushroom slapped that girl last period because she said "oh my gosh guys guess what happened?"
by drew s April 12, 2004
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Being slapped with a wang. Usually a hard wang.
"So this chick was blowin' some guy one day, and he pulled out and gave her a mushroom slap!"
by D.Socko May 08, 2004
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When you slap someone with your soft circumcised penis causing a small red mushroom shaped mark on the skin from the head of the penis.
Dude I mushroom slapped her last night right on the cheek, it left a red mark!
by Aiden07321 June 06, 2010
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When a guy takes his hard dick, and swings it as hard as he can, hitting a person (hopefully a girl) on her body with his mushroom. If done correctly it will leave a mushroom imprint for several minutes with a lasting red spot afterwards.

(not easy to do)
ex) mushroom slap her in the face and it will leave a mark. very funny. total ownage
by Mushroom slap 696969 May 14, 2009
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When u slap a bitch so hard with ur pee pee that she gets goes retarded
I herd Jenny got the mushroom slap of death now she’s in in special ed class
by Grass man December 10, 2019
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A Mushroom Slap delivered with such force that; a bruise, swelling, permanent tissue damage, or even breakage to the jaw is resultant.
"My God Charlie, what happened?-are you ok?"

"Ben gave me an Intergallactic Mushroom Slap. Because he's on parole the government is footing the cosmetic surgery bill, so hopefully I'll be able to laugh about it in years to come."
by ImissPaulineFowler September 08, 2009
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