An animal was slaughtered, then a part of it was deeped in hot heated oil, and it was making moves. What does it mean?

The phenomenon you're describing is often associated with the reaction of a recently slaughtered animal’s nervous system. When an animal is killed, certain reflexes can still occur for a short period of time due to residual nerve activity. If a piece of meat is placed in hot oil, the heat can stimulate these nerves, causing muscle contractions that can make it appear as though the meat is "moving." This type of reaction can be particularly pronounced in certain animals, and it tends to be most noticeable when the animal has been killed very recently. It's important to note that these movements are not indicative of consciousness or awareness; rather, they are involuntary responses to nerve stimulation.