The liquid that is held between the cheeks of your ass that smells like a mixture of sweat and shit.
Person 1: Dude, I was sitting down all day, and I've accumulated some Bum Sauce
Person 2: EEEWW!! THAT'S GROSS! AIN'T NOBODY WANNA HEAR ABOUT YOUR BUM SAUCE!!
Person 2: EEEWW!! THAT'S GROSS! AIN'T NOBODY WANNA HEAR ABOUT YOUR BUM SAUCE!!
by Jeffery Deadstein May 13, 2020
by Jeffery Deadstein May 06, 2020