The act of farting extremely loudly and abruptly.
Damn bro did you just bust a grumpy? I can smell it all the way over here!
When a person passes a particularly foul fart.
Man, who just busted a grumpy in here?
When someone farts and it's a really stinky one!
"Man who busted a grumpy?"
having an orgasm, especially when one has an angry-looking o-face
After getting 20 minutes of head, he would bust a grumpy all over her face
When Grumpy the fifth Dwarf has decided to over-consume his thanksgiving dinner and bursts. His whole booty has become tooty.
She bust a grumpy