have rocks in (one's) head(redirected from have rocks in your head)
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have rocks in (one's) head
To be thoroughly stupid, crazy, absurd, incorrect, etc. You must have rocks in your head if you think the bank will approve you for another loan.
have rocks in one's head
Fig. to be silly or crazy. John is a real nut. He has rocks in his head. I don't have rocks in my head—I'm just different.