Since the delicate geniuses can't be bothered to answer, I will.
Poop that floats likes you and wants to be closer to you. Poop that sinks can't wait to get away from you and hates you. Or, sometimes the poop has committed a crime and is trying to make the getaway. Ever heard of a turdburgler? That is a poop that won't float. It is trying to get away from the scene of the crime.
hth
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