What? How would that make it a good thing?
EX.A - Grunt Push it, come on 315!!! YESSS!!! oh man I SHARTED!! WEAKKK!!!
As you can see from example A, the PR is obviously a good thing, but the pants pooping is considered "weak." and completely ruins the sense of victory.
Use your head. There is no justification for pooping of the pants.
When you're grindin' out a squat and your pants start feeling hot diarrhea. If your deadlift felt too easy and your ass starts feeling greasy diarrhea.