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"shiitake slap" also known as mushroom slapping, or cock smacking, is the action of cock smacking. A shiitake slap is when a person (usually circumsized male) slaps another person with their genetilia, leaving a mushroom imprint on their head.
Jake shiitake slapped Khale and left a mushroom imprint on his head.
I will shiitake slap you!
by Aces R High October 20, 2006
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