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
they were playing music and you couldn't swear so we say mutha grumbo also known as mutha fucka so i guess the definition would be FUCKER
get up off yo ass mutha grumbo
by meelo grumbo April 04, 2009