Definitions by Sgt Poopybutthole

Bum dust 

Bum-dust: The bit of V shaped residue left on the back of a toilet seat after a poo.

Commonly containing a mixture of underwear fluff, skin and pubes.

Ffs Andy! You've left bum dust on the toilet again!

Bum dust by Sgt Poopybutthole June 10, 2022