Definitions by Gary K.

butt worm 

A Butt Worm (or pinworm) is a parasite often found in feces, and the eggs can be spread about very easily upon contact. Having Butt Worms often leads to itchy/crawly sensations

It's a good thing I don't work in the stables, I don't wanna get any butt worms.

butt worm by Gary K. June 12, 2008