Definitions by rl45401

Bum-must 

The smell of one's anus. Often relating to a mold/mildew infested mobile home must. The musty smell of sweat and gas that is passed by an individual.

Rex: Damn, that fart reeked of Bum-must!

Shawn: Yup, I worked hard on not cleaning by butt for a week

Bum-must by rl45401 November 2, 2011