The phrase "bust a grumpy" is used to refer to anything that is excreted through the anus, including both gas and feces. To properly bust a grumpy, one must abide by the following rules:
-Claim that he or she is going to "bust a grumpy"
-Excrete something (be it solid, liquid, or gas) from the anus.
Tom:"Dude, I'm gonna bust a grumpy!"
Walter:"Oh, no! Wait!"
Tom:*Farts*
Walter:"Oh, man! Everybody watch out, Tom's bustin' grumpies!"
Most commonly used in reference to flatulence. Specifically refers to the act of expelling acutely pungent methane gas out of one's butt.
It was the combination of 3 large bean burritos, 2 Red Bulls and a large pickled ghost pepper that caused Jordan to bust a grumpy.
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!
To have to go number 2.
To poop.
To make naughty water.
Brennen had to go bust a grumpy, becuase he'd tried to move and built up enough bodily waste to kill an elephant.
Passing a large usually unwilling stool that is rocky hard and very large.
Joban: I gots to go bust a grumpy before i shit my pants.
Jovan: Make sure you dont miss the bowl again.
having to take a crap.
Dude, I have gotta bust a grumpy.
Okay who is busting a grumpy? It smells like rotten eggs in here.