Making beautiful, nasty, full eye-contact love in, around, or up against a dumpster, usually with a hooker from Craigslist and at your best friend's wedding.
Da'Ron returned to the ceremony with his date after grouching in the alleyway, disheveled, wearing only men's stars and stripes bikini underwear. "America, fuck yea" - garbage truck beeping could be heard in the distance.
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."
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 skatepark.