I have the perfect idea for an animation, if it's not too much trouble!

There's a scene in the anime Tokyo Magnitude 8.0 where a young girl becomes desperate to poop and eventually is forced to use a small, disposable toilet behind some bushes for relief. She's not shown using it, unfortunately, but that's where you come in, Yummy!
I always imagined her hastily ripping through the package and struggling to set the toilet up properly because of her intense urge, but once she gets it right, she hurries her butt onto it and basically explodes with a torrent of soft, light brown mush. You don't have to do it exactly how I described it though, I mean if you decide to take this on.

www.youtube.com/watch?v=xWL46U-VK8M
Whole scene is from about 2:35 - 8:20 for anyone who hasn't seen it, starting from when the urge first hits. A demonstration of how someone looks when sitting on the portable toilet can be seen at 5:13.