have rocks in (one's) head

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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.

Name	Pronounced	Usage
Georgeta	-	Romanian
Vilmos	VEEL-mosh	Hungarian
MarilÈNe	-	French
Latham	['leiθəm]
Jancsi	YAWN-chee	Hungarian
Paca	PAH-kah	Spanish