Busting a grumpy 

When someone farts.

Okay who is busting a grumpy? It smells like rotten eggs in here.

Busting a grumpy by LeRoy Breeze August 27, 2013

Bustin a grumpy 

Farting a sweaty, disgusting, sad sounding, shittyass, poop out of your and/vagina
or its just taking a sweaty shit

The other day in art class i be bustin a grumpy so bad that everyone around me had to leave the room and it was later put under quarantine.

Bustin a grumpy by tubbsmcgee101 January 15, 2009