Toilet slayer

a person who takes heavy bathroom breaks many, many times per day, basically slaying the toilet.

Ever since Raj started eating Taco Bell every day he's become a toilet slayer

Buffy The Toilet Slayer

Inspired by "Buffy The Vampire Slayer" - The TV Show

Someone (usually careless coworker) who brutally abuses the bathroom/toilet. Especially dangerous if there is poor ventilation and/or poor flushing function or simply forgets to flush.
Leaves door open to fill the hallway with stench.

Therefore "Slaying the Toilet"

- Hey man,
I would not go out to the restroom for the next 40-45 minutes, just saw "Buffy The Toilet Slayer" come out of there

- Yeah thanks for the heads up! Buffy destroys that bathroom shamelessly like there is no tomorrow.

- I know right! He must have come down with that RAS - "Rotten Asshole Syndrome"