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The sensation of two midgets simultaneously biting the inside of your ass.
"Oh my god, Britney, I just fucked Jake last night. It Felt Like Grumbo."
by Shoes Hee January 22, 2009
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2
something that's really fucking gross or abnormal.
Dude, look at this picture; look how grumbo those tits are lol
by watdafak April 22, 2016
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3
to take a poop,the act of deficating
after all the coffee i drank i had to take a mad grumbo
by ameecia May 26, 2005
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