Top Definition
mushroom: the shape of the tip of the penis when erect, if circumcised.
effect: the feeling that takes over when you see it, makes you want to suck on it (only if you enjoy oral sex)

-its when you see it that you want to suck on it.
Everytime a girl sees my hard dick they jump right on it and give me head. It's like.. a mushroom effect.
by SmileyJay May 09, 2008
1 more definition
describing the fat that hangs from a girl over her pants; it appears like a mushroom
dude look at that girls jeans there soo tight she's got a mushroom effect
by alfonso martinez November 13, 2007

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