rocks in (one's) head

Used to indicate one's complete stupidity, craziness, or absurdity. You've got rocks in your head if you think the bank will approve you for another loan. I've never seen so many errors in an accounting ledger in my life. Whoever did this must have rocks in their head.

See also: head, rock

See also:

stupid is as stupid does
(one's) jollies
be a slam-clicker
queer in the attic
(from) top to toe
a clip (a)round the ear
a clip (a)round the ear hole
be beyond the point of no return
(one's) loved ones
(one's) day in court

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