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
Mallory	['mæləri]
NedİM	-	Turkish
Maddalena	mahd-dah-LE-nah	Italian
BÈR	BER	Limburgish
Eda (1)	-	Turkish
Patterson	['pætəsən]