Yeterday evening I made a big poopie in my diaper, than sat down to the chair and mush it all over my nappy. And spend the all night in that very full diaper. It was beautiful, but morning... the smell was horrible. Luckily didn't get rash, I always use lot of diaper rash creme and baby powder.
But can't poop laying in bed, just in case of a very soft poop like a diarrhea.