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2.
an extremely ugly girl that looks like a man
"seriously dude, why are you dating that mushroom taco?"
by skyman235 March 31, 2010
 
1.
A euphemism for the penis - the tip of which resembles a mushroom - entering the vagina - which resembles a taco.
Sweet Christ that bag of bitchmeat operating the tilt-a-whirl is so humpable, I want to give her a mushroom taco with sour cream.
by Killy Pistol November 30, 2007