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1.
The unconfortable itchy feeling in the anus usually after a terrible wiping experience
Brock: So how'd that deuce go?

Pierce: Awful, it was one of those craps that took 150 wipes. My anus will be itching in no time

Brock: That sucks, your gonna get butt rot
by BS Man February 11, 2006
 
2.
what's filthier than ass?..many things. buttrot is one of them.

another word for scum or disease
doctor! i've got bad case buttrot
doc: i'll just prescribe you with a crackstrap
by 7evilz May 06, 2005
 
3.
When you have been sat down for too long and your arse starts to feel numb/sore

I've been sitting down for 10 hours straight and I have a serious case of Butt rot :/

by Tecviper May 24, 2003