Top Definition
The act of making an exaggerated frown in the shape of an upside down "U." Often used when someone is being ridiculed in a joking situation.
While grumping be sure to make your frown as curvy and unpleasant as possible
ayon kay mmoneh ika-16 ng Nobyembre, 2011

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To be actively grumpy, in such a way that the person in question is actively making an effort to be grumpy and, moreover, express that grumpiness.
Dude: Harrumph. Grr. I'm so grumpy.
Guy: Dude, why are you grumping like that?
ayon kay BTKD ika-28 ng Pebrero, 2011

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The act of "dry humping" while grinding on a dance floor.
"Yo, that dude is dancing so hard with that chick he's grumping!"
ayon kay Blowfish3 ika-22 ng Oktubre, 2009

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Johnson's slow, angry and sad behavior when he's grumpy.
"Why does he seems depressed today?"
"He's just grumpy. He does it really well, too. I woke up today, planning to be grumpy, but it just didn't work out."
"Okay, he's grumping his way over; we can leave now."
ayon kay abalone gyro ika-23 ng Abril, 2004

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a sexual practice involving placing your face inbetween the legs of a corpse and getting a partner to jump hard on the corpse's stomach.
Hey Keith, wanna go grumping tonight?
ayon kay Kev Fisher ika-26 ng Abril, 2006

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