Worm Butt 

When you see something that scares or disgusts you so much... that you clinch your buttcheeks so tightly, that not even a worm could get inside.

That new Nitemare on Elm Street movie gave me worm butt!

Worm Butt by Brownie ESQ July 9, 2010

Butt Worm 

Sticking ones finger in the anus of another while they walk up the stairs. Usually accompanied by a wiggling motion and shouting "Butt Worm!"

I was walking up the steps and my girlfriend totally Butt wormed me!

Butt Worm by Capt. Josh January 4, 2011

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

Butter Worm 

The post ejaculation penis withdrawn from the bung hole after anal sex.

After giving his girlfriend a good old fashioned anal pounding, Carl pulled out his Butter Worm and rubbed it on her chin.

Butter Worm by Eaton Holgoode March 28, 2015