two of the same word combined, a rare term used for red headed individuals in a small community, or an absolute moron, maybeeven both depending on the context
person 1: look at that red red!
person 2: do you mean I'm stupid or soulless?
Person 1: both
Red-Over-Red in navigational aids is the display of two Red lights in a vertical line, visible at night which means the Captain is dead. Vessel not under command, no Commanding Officer.