When you go take a poo that looks normal in the bowl but when you flush the toilet the seemingly solid movement suddenly disintegrates into a brown cloud.
I took a shit that looked like it could choke a donkey but I realized when I flushed that it was just a Hokus Pookus.
Poopourri is the residue left on a toilet seat after someone has taken a bad and messy shit. Generally so bad that it requires you to seek another toilet to utilize.
Damn, who the hell keeps leaving the poopourri all over the shitter? I'm tired of having to run upstairs because our crapper is so fucked up!