What a great question!
When it comes to poopy diapers, my mom had a lot of them, so I learned from the best.
Filling your pants. Messing your britches.
Doing your business in your pants.
Nude is WORSE, much worse.
If you are in public, a store, a mall, a park, a street, etc. and you are wearing a diaper, perhaps even baby clothes with a bulging diaper underneath, it's no big deal.