Buttfury 

The act of shitting so hard it feels like a tornado out your ass.

Guy 1 "I need to go to the toilet"
Guy 2 "k"
*5mins later*
Guy 1 "I just had the sickest buttfury"
Guy 2 "Gross dude" or "Fucking awesome"

Buttfury by Cumplosa December 13, 2012

Buttfur 

Hair in the anal region.

Your grandma has enough buttfur to make an exquisite Persian rug.

Buttfur by buy fur May 12, 2010

Buttfurnace 

A characteristic of the female body in which her butt produces a lot of heat much like that of a furnace particularly when aroused or in bed.

Wow, your butt is so hot it's like a buttfurnace.

Buttfurnace by Shawn Beals June 19, 2018