The mix off blood, cum and shit that is often created during anal sex. It's dirty brownish yellow color and thick, soupy consistency resembles Dijon mustard.
Wow, Mike, that really sounded like a fart. No, dude, it was butt mustard. I was putting ketchup on my burger.
By Angil
Mustard Butt
The aftermath of hot snakes from a week full of taco bell and indian food often resulting in bleeding rectum and or severe uunimaginable loss of all hope for a normal life