have rocks in one's 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have rocks in one’s head
tv. to be silly or crazy. (Have got can replace have.) She’s got rocks in her head if she thinks that.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
rocks in one's head, to have
To say or do something crazy, ridiculous, or stupid. This slangy expression, often used in a not very polite response to a bizarre statement or action, dates from about 1940. Presumably it accuses the person of having rocks instead of brains, as in “Drive all of two blocks to get the paper? Do you have rocks in your head?”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer