expressões com a palavra nothing #1: have nothing between the ears

Imagine you find someone attractive right at the corner of a party. You flirt with her, tries to approach and when you finally have the chance to have a little chat with her, you get completely disappointed. She's just stupid. She doesn't know anything you are talking about and when you try to keep the conversation going, she has nothing to say. While talking to a friend of yours about that girl you say: she is very good-looking and everything, but she has nothing between the ears.

When you say someone has nothing between the ears, it means they're very stupid. Just take the literal meaning of the expression. If you have nothing between your ears, it means you don't have a brain, therefore you're very stupid. That's all for today. Talk to you next time!