between your ears

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between the/(one's) ears

In one's brain. Often used in the phrase "have nothing between the/(one's) ears" to suggest that one does not have much common sense or basic intelligence. 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.
See also: ear

between your ears

or

between the ears

INFORMAL
If someone has nothing or little between their ears or between the ears, they are not clever. Footballers often have a reputation of not having much between the ears. He doesn't have a lot between the ears. Note: These expressions are usually used light-heartedly.
See also: ear
References in periodicals archive ?
But to exploit this intensity and timing difference, the sound's wavelength must be much smaller than the distance between the ears.
Reptiles, birds and amphibians, however, generally do not hear sounds above 10,000 hertz, and for many of these creatures, including coqui frogs, the distance between the ears is too small to localize sound the mammalian way.