Lice that infest the hair close to the anus.
Dude, you got Butt Lice crawling outta your ass.
by Chris X September 18, 2008
1 more definition
Vicious creatures that attack your butt endlessly. Usually, the only treatment is to burn them out with a lighter and some flatulence. These little critters are usually transmitted by someone who's alias is BewareOfButtlice. He keeps them in a jar. They respect him and follow his orders. Avoid BewareOfButtlice at all costs.
Man, that Buttlice was all over my twat.
by BewareOfButtlice January 17, 2008