medieval slang word for "moron", "idiot", and so on. was used in the high Middle Ages.
Medieval Guard A: "we should put a guard on the outside of the palace to prevent thieves from stealing things from it."
Medieval Guard B: "why would we want to put guards on the outside, when what we care about is on the inside??"
Medieval Guard A: "so we can prevent them from coming on the inside, you tafford."