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An act of vandalism. The perpetrator, while hanging out of the window of a Sedan, grabs a garbage bag placed on the side of the road for pick-up and drags it down the street until the bag breaks scattering the thrash.

Caution: act may cause extreme moments of euphoria.
"Stubbie and the gang went out grouching the evening before, trash was scattered all up and down Mott Park."
by OleE September 25, 2006
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2
When someone takes the top off one of those trashcans at parks or something, takes the trash bag out, gets inside, puts the top back on and hot boxes a joint/blunt/etc. inside.
Yo last night was awesome, we went grouching at the skate park.
by ssd14pa November 07, 2010
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3
The act of climbing inside a garbage bin and being surly and borderline agressive to pedestrians in a similar fashion to Oscar the Grouch.
Did you see that guy in the bin? What's with that?
Yeah, he's grouching the food court
by baron25 May 13, 2011
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4
The act of being a grouch.
Ashley wouldn't quit grouching today. She's so bitter.
by ms24 October 05, 2010
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