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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The prizewinning standout member in any given group of douchebags. Shortened from "Group Douche" (and yes, every group has one).
See the one on the right who's talking over everyone else and making a big show over his iPhone? Ok, the guy next to him with the popped collar, orange tan and inability to stop "adjusting himself" is obviously the grouche.
by Sheisty McCoy January 23, 2008
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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 8, 2010
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Sexual intercourse scenario in which you are inside a stolen city trash bin.
I took her to the dungeon and we did the grouch. It was quite disgusting
by Dirty Moose December 28, 2013
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To fuck someone in a garbage can. "Groucho," a variant of "grouch," means to fuck someone in a garbage can while wearing large glasses and a fake mustache.
The hobo was exhausted after a quick grouch with a hipster.
by RobertMontana May 3, 2010
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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 14, 2011
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The act of being a grouch.
Ashley wouldn't quit grouching today. She's so bitter.
by ms24 October 6, 2010
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