A person who has a perfectly good working brain and chooses not to use it.
Kenneth has shown time and time again that he is a rat face goof retard.
Commonly used as an insult to people who don’t have common sense or are just dumb in general.
You see that guy over there? He’s a retard
someone who lives under a rock
Person 1 : "wow!, you're retarded"
Person 2: "no, I'm Patrick Star's neighbour."