Stool’s ability to float is usually related to air. A high fiber diet and gas can cause stool to float.
A diet high in fiber leads to increased bacterial fermentation during digestion. This produces more air, which can get trapped in stool, causing it to float.
This same source says that too much fat could also cause floating, but from a different article:
Some people think that floating poop is caused by fat, but it’s usually caused by gas. Research has indicated that once floating stools were degassed, they weighed the same as sinking poop. This indicates that gas was responsible for making floating stools float, rather than fat inside the poop.
If they float, it typically means the person is consuming too much fat in their diet. Not always but moat times.
Source: https://www.medicalnewstoday.com/articles/325274
This same source says that too much fat could also cause floating, but from a different article:
Source: https://www.webmd.com/digestive-disorders/what-to-know-about-floating-stools
But, in general, not necessarily something to worry about.
I need to start shitting in moats again
What do you call fine paintings floating in a water-filled ditch? Mozart!
That’s close to being a joke.
Which fits perfectly to the metaphor