Mustard Bun 

An indiscriminate sexual orifice, usually used in context of making fun of one's homosexuality.

Smitty was watching as Liam was measuring Damien's Girthy-Base, then Damien stuck it in his mustard bun.

Mustard Bun by SauceyGirth September 26, 2014

I can't put a patty on a bun, with lettuce, cheese, onions, tomatoes, ketchup, mustard, pickles, and top bun together in that order! 

a gift from above

I CANT FUCKING DO IT. THIS SHIT IS SO HARD AND SO BULLSHIT. I can't put a patty on a bun, with lettuce, cheese, onions, tomatoes, ketchup, mustard, pickles, and top bun together in that order!

I can't put a patty on a bun, with lettuce, cheese, onions, tomatoes, ketchup, mustard, pickles, and top bun together in that order! by innmypusay May 17, 2022

Bung Mustard 

Firey, bung burning, explosive diarrhea. Like liquid acid pouring from your back door. Leaves the oring stinging for some period of time.

Oh man the bung mustard is really bad. I may have food poisoning. My ass is on fire!!!

Bung Mustard by Eaton Holgoode April 12, 2017