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

by rl45401 November 2, 2011

Bum mustard

Bum mustard is the creamy result of having someone ejaculate during anal sex. It is yellow in colour and has a thick creamy consistency.

I came and when I pulled out there was bum mustard all over!

by Survivor bear August 12, 2016