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1.
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
автор: mmoneh 16 ноября 2011
 
2.
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?
автор: BTKD 28 февраля 2011
 
3.
The act of "dry humping" while grinding on a dance floor.
"Yo, that dude is dancing so hard with that chick he's grumping!"
автор: Blowfish3 22 октября 2009
 
4.
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."
автор: abalone gyro 23 апреля 2004
 
5.
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?
автор: Kev Fisher 26 апреля 2006