Invisi-shit

Usual term for taking a dump, then wiping your ass to find that nothing is on the toilet paper.

"Hey man, I'm sorry I wasted so much of your toilet paper, I wasn't sure if I had an invisi-shit or if I wasn't wiping properly."

"...You're buying me more Charmin Ultra then."

by Inyourendo^_^ December 15, 2008