A dolt; a fool; someone having a small brain.
A subcomponent of a brain or thinking system.
A small brain; the brain of someone or something small or of someone who is not very intelligent.
An idiot, a stupid person.
A person of mixed racial or ethnic ancestry.
A mongrel dog (or sometimes cat); an animal of mixed breed or uncertain origin.
A person from the United States, in reference to sense 2.