have rocks in one’s head

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.
See also: have, head, rock
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • have a head
  • helium head
  • a head
  • crazy in the head
  • head in
  • head for the setting sun
  • head into
  • head into (something)
  • (one's) head is more than just a hat rack
  • hatrack