He appears near the end of Don't Hug Me I'm Scared 6 when Red Guy flashed through various teachers old and new as they were scaring and torturing Yellow Guy at his teacher summoning computer. He seems to be screaming.
It is a floating red meat cube with some darker spots. It has two round eyes, situated pretty far from each other. It also has a large rectangular mouth with square teeth and sticking out tongue.
- The Meat Cube is most likely arguably a steak.