have nothing between the/(one's) ears(redirected from has nothing between his ears)
have nothing between the/(one's) ears
To be rather stupid, dull, or dimwitted; to not have much common sense or basic intelligence. The expression is a way of saying that one has no brain. She seems nice enough, but I get the sense that she has nothing between her ears. Jake always goes out with really attractive guys that have nothing between the ears.