Exocannibalism is when one group of people eats other people from a different group or tribe. It's like when you sometimes eat your brother's candy because you want it and he doesn't have any more. But instead of candy, it's people eating people. This is not a good thing to do because it hurts other people and it can make you sick. Just like how eating too much candy can make you sick. It's important to be kind and respectful to everyone, and not hurt them or take what's theirs.