I have seen a lot of stories online of people getting things stuck in there and doctors having to remove it, even items like cucumbers. I get that an item with a highly irregular shape could get stuck. But if it’s something long and rounded, why can people not just poop it out? Is it because the item isn’t soft enough?
I’m guessing that at some point your rectum cramps closed and the foreign object ends up being trapped behind the sphincter.
Note that I’m not a medical professional, nor do I pretend to be one on the internet. I do have personal lived experience of constipation induced cramping and it’s not fun, not to mention, painful to the point of passing out.