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 8, 2009
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Similar to a mushroom slap but with the added bonus of doing it after you've ejaculated and your penis is covered in semen.
Guy 1: So how'd it go with Julia last night?

Guy 2: It was awesome!... Up until she just walked out after I Cream of Mushroom Slapped her in the face...

Guy 1: Rough dude. Guess she just isn't into that kind of stuff.
by SJ U KNOW March 26, 2012
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To awaken one under the influence of psilocybin from incoherence with a quick slap of the hand to the face
Tony mushroom slapped Albert so as to awaken him from his incomprehensibly negative, drug-induced rant. (But Bert just became further enraged and had to be wheel chaired to bed.)
by Alphonse Drizzny January 5, 2009
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