off rocker

off (one's) rocker

Crazy; mentally unsound; extremely foolish. I'm going to go off my rocker if I have to hear that song one more time! I think Jane's grandmother is a little off her rocker these days. You must be off your rocker if you think that's a good idea!
See also: off, rocker
Farlex Dictionary of Idioms.

*off one's rocker

 and *off one's nut; *off one's trolley
Fig. crazy; silly. (*Typically: be ~; go ~.) Sometimes, Bob, I think you're off your rocker. Good grief, John. You're off your nut.
See also: off, rocker
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

off (one's) rocker

Slang
Out of one's mind; crazy.
See also: off, rocker
American Heritage® Dictionary of the English Language, Fifth Edition.

off one's head, rocker, etc.

See go off one's head.
See also: off
The Dictionary of Clichés by Christine Ammer
See also:
  • off (one's) rocker
  • off one’s rocker
  • off one's rocker
  • off your rocker
  • off (one's) dot
  • rocker
  • (one) is off (one's) rocker
  • be off (one's) rocker
  • be off (one's) dot
  • go off (one's) rocker