I think there's no word for the meat of humans because in general, we don't need one. "Beef," "pork," etc exist to distinguish talking about animal-as-food from animal-as-creature. Since for the most part, we don't talk about human meat, we don't have a word for it.
"Long pig" was most often used in the Caribbean as the descriptor for human meat. Biologically, I believe we would be a white meat mammal, like pork. We're neither herbivores nor ruminants, like cattle. And we're certainly not birds.
Kuru is why we shouldn't eat other humans. But that really only applies to the brain matter.
Also, even if the human had enough nutrients to feed sixty adults, we still wasted a lot of energy raising it to adulthood. In terms of nutritional efficiency, vegetarianism is the superior choice.