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!!
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1. when you have an abnormally sized rooster
2. when you got one thick-ass dick, bitch
horny woman: Hey, you got a Phat Cock?
horny guy: Hell yeah, want to sex?
Horny woman: yum.