Hello, everyone! In the TV series "The Walking Dead" the protagonists, some of the few survivors to a zombie plague, find a group of living, non-infected convicts locked in the prison cafeteria. They have been locked there for several months, feeding from the supplies in the neighboring pantry. The dialogue is between T-Dog, one of the rescuers, and Oscar and Axel, two of the convicts: T-DOG: You never tried to break out of here? OSCAR: Yeah, we tried to take the doors off. But if you make one peep in here, then those freaks'll be lined up outside the door growling, trying to get in. Windows got bars on there that He-Man couldn't get through. AXEL: Bigger than a 5x8. The "freaks" are the zombies who infested the rest of the complex. I even know who He-Man is, what I do not understand, though, is the "5x8" remark (pronounced "five by eight"). Could you, please, help me out? Thank you.