When gas combines with a steaming shit on its way of of the rectum it creates a bubble that looks like someone blowing a bubble with chewing gum.
while cleaning the litter box you notice what looks like a balloon sticking out of the side of a shit
( ShitBubble )
The 30-second window of opportunity, that accompanies the sudden and powerful urge to have a bowel movement. In which you either find a bathroom, or risk shitting your pants.
"Oh God....I feel a shit bubble coming on! PULL THE CAR OVER! NOW!!"
The act of drinking preservative that is in an olive cantainer. then farting a lot and then farting a bubble of shit. Leaving a circle of shit in your underwear
He had just made a shit bubble in his underwear