When you grab a guys ass and their dick and push them towards eachother
Dude Thomas just gave Freddy a Mushroom Sandwich
by Jawzzii December 9, 2019
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A Mushroom Sandwich is when you poop on a person, then sit in it.
Paris Hilton loves getting Mushroom Sandwiches.

Jake loves getting Mushroom Sandwiches from Conlan.
by i love phoenixville March 14, 2009
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