Meat glue is always going to be totally weird sounding but we've all eaten it before (if you eat at fast food restaurants, at least). It's derived from blood and is a clotting agent that allows different types of meat to stick to each other, hence the name. You can do a lot of weird, Frankenstein-type experiments with it.
Here's a fake ribeye being made from beef brisket and cheap chopped up stew meat. He basically positioned the cheaper cuts of meat around each other to mimic the layout of a ribeye and then glued it all up so it stuck together. After he cooked it, he said if he didn't know any better, he would think it was a Ribeye.