Top Definition
A play-on-words of the Spanish phrase "Muchos Gracias".
Another way of saying "your ass is grass".
Person A: Joe is being a real dumbass. And I heard he boinked Alex's girlfriend.

Person B: Woa. That's gonna be Muchos Grassy-Ass.
by OhMyGawth July 11, 2009
6 Words related to Muchos Grassy-Ass

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