Similarly to hoop stress, poop stress is the result of an internal pressure acting on a thin walled pressure vessel. The internal pressure is usually due to grade F fast-food diarrhea or the buildup of dairy queen fart gas.
It should also be noted that the temperature in the vessel is directly proportional to the pressure incurred. see hot shit
Damn, i have the gnarliest poop stress from those jack-in-the box tacos I ate last night.