Definitions by BTKD

Grumping 

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?

Grumping by BTKD March 15, 2011