go off (one's) rocker

go off (one's) rocker

To become crazy or mentally unsound; to become extremely foolish or foolhardy. I'm going to go off my rocker if I have to hear that blasted song once more! I think Jane's grandmother has gone off her rocker lately. You must have gone off your rocker if you think that's a good idea!
See also: go, off, rocker
Farlex Dictionary of Idioms.
See also:
  • go off (one's) dot
  • lose (one's) mind
  • lose one's mind
  • lose your mind
  • lose one's buttons
  • lose (one's) buttons
  • lose all one’s marbles
  • lose one’s marbles
  • lose one's marbles
  • lose your marbles