Top Definition
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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