Shrodinger's fart 

The moments when, feeling the fabric leave your arse cheeks, but it could be either a large fart bubble or a sneaky poo. Unsure if it's fart or shart, it being considered to be simultaneously both fart and shart until your pants are dropped & the remnants observed.

"Oh man, I had way to much Guinness to drink last night. I woke up this morning and had to run to the loo after a Shrodinger's fart"

Shrodinger's fart by ShrodingerFart May 22, 2016

Schrodinger's fart 

an ambiguously ominous pressure in one's bowel that is simultaneously flatulence, diarrhea, and a bowel movement until it is released, at which point quantum superposition ends and one must simply hope that they guessed correctly.

It's a good thing I went to the bathroom for that Schrodinger's fart, or else it would have been messy.

Schrodinger's fart by Squeaky Farts January 7, 2021