Top Definition
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
by rl45401 November 01, 2011
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