Agreed. Though, I don't have anything against Kirby for that scene. I actually liked her character in the movie. And honestly, if I we're in a situation like that (after witnessing a bunch of cannibalistic tribal members dismember my friend into multiple pieces)I'd probably have to take a sh#t too. Though, I could've done without that scene. It was somewhat realisticbut rather goofy.

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It could be assumed she was given something to clean, or it's a glaring continuity error much like the terrible Jaws the Revenge where Caine's character swims to the boat and when he gets on the boat it's utterly dry like he never swam in the damn water.
To the op wow it's not stupid the furthest damn thing from it.
People throw up when seeing dead bodies so plus they're in a area where all of their bodies haven't adjusted to the area since its the 1st time they were ever there along with having seen the damn savage actions of cannibalism while one of their associates was still freakin alive.
It was to show things go from bad to awful including her having to go the bathroom like a wild animal inside the damn prison along with the brutal tribe laughing at her terrible situation.
I assume the Savage Cannibal Tribe mistakenly believe them to be loathable loggers it made them happy to see a person humiliated and miserable.

How come her underwear was spotless when she had to strip down later

How did she manage to get herself cleaned up? Later on when the three girls are taken out and stripped to their underwear there's no sign of her earlier mishap.

I felt like the scene was there to dehumanize them. They were basically pigs in a pen, waiting to be slaughtered. Her pooping in the cage showed how unhuman the tribe thought of them.

This movie was definitely not typical Roth fare, but ultimately, it was still an Eli Roth movie.
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It was stupid especially since it remarkably disappeared without a trace.

I agree. Having diarrhea in that situation is probably one of my most dreaded things. Having diarrhea in any stressful but normal situation gives me anxiety. In that situation, would definitely be a real horror for me

It wasn't stupid. They were in the jungle, there are probably a million and one things that make you crap your pants. And their predicament hardly made it any easier.. The same would probably happen to you and anyone else who thought it was stupid.

Well this way people won't bitch and moan about "What if they have to go to the bathroom?!?!?!".

Touchy? What? I just said the scene is stupid. Which it is.

U see your friend cannibalized yet your touchy at another sh***** their pants. Wasnt as gory as i thought