Honestly, over 8 days, I feel like even if you only drank some kind of liquid nutrients, your body would still filter out enough solids that you'd have something moving through your colon
Fun fact of the day: extreme constipation can result in build up that can reach all the way to your stomach. If the situation does not clear up soon after, patients might throw up poop. This is extremely dangerous and often results in suffocation by shit.
When I went to confirmation camp, it was on an island with no water toilets, only outhouses. Some of my peers just wouldn't use them for shitting, as they had never had to be without a "regular" toilet.
When there was a visiting day like a week after the start of the camp, I think someone had felt too nauseous and given in. I know this because I was assigned to empty the outhouse barrels. Which some mischievous visitors (older siblings who had gone through the camp themselves a year or couple before) had filled up to the brim with a hose, so all the shit was in liquid.
When we emptied them I saw a shit log the size of my forearm. All veiny and shit. Wouldn't be out of place in the South Park episode about massive poos.
So idk man, I think it's a joke but also, people do do that. ("Doo-doo", hehehe.)
As an experienced butt plug enjoyer, the plug will shoot out if you have enough stuff trying to exit your body. And if you have even SOME poo that really needs to come out, it will be SUPREMELY uncomfortable.
Shit yourself in front of him, angry face style. Like a pain shit you're mad at. No embarrassment or tears. Own it. If he loves you after that, marry him