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To speak gibberish or garbled words. To mumble while saying things no one can understand. To speak drunkenly while sober.
Grumin can sometimes be funny and used mocklingly, but at other times it is annoying and overplayed.
Guy1:"Gots de da gram fence knot!"
Guy2:"Dude stop the grumin its gettin annoying."
by Graham-Chan March 14, 2007
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