@pipivovott its a subcategory of shit-pressure, most commonly experienced as "early morning shit pressure", which is when gas is built up behind a solid fiber-rich protein-rich turd inside your rectum. when toilet is reached, the solid log is launched out of your ass in not so many milliseconds.

diarrhea pressure is the same, but instead of 50% solid log, and 50% gas, its 50% liquid shit and 50+% gas, with the gas ever increasing

ive drawn you a helpful diagram that should be helpful

it is somewhat possible to relieve shit pressure if you point your back/ass up into the sky, this will cause soft and almost-unnoticable farts, causing pressure lowering