rocks in one's head, have

Show poor judgment, act stupidly, as in If you think that's an accurate summary, you've got rocks in your head. The rocks in this idiom are a supposed substitute for brains. [Slang; 1940s]

Common Names:

Name	Pronounced	Usage
Aleid	AH-liet	Dutch
Bartol	-	Croatian (Rare)
Benedikt	BE-ne-dikt (German), bye-nye-DEEKT (Russian), bee-nee-DEEKT (Russian)	German, Russian, Icelandic, Czech
TÍMea	-	Hungarian
Priita	PREE:-tah	Finnish
Tamsyn	TAM-sin	English (British)