n. is a poop that is especially bad and stinks up the whole bathroom, it is often paired with lots of grunting and pushing.
dude, i just dropped a mean grumpy in the bathroom.
by jojoboneroo February 06, 2006
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A fart characterised by an extraordinary long low growl when releasing gas from the rectum. The name derives from the creators of such farts, grumpy old men. also because the fart seems to mimic the sound of a grumpy old man.
Buuuuurrrrttt! Fuck i just left a mean mr. Grumpy
by Paul Merr November 05, 2018
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