off your 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 your rocker

INFORMAL
If someone is off their rocker, they are crazy. He must be off his rocker, paying that much for a shirt! Note: You can also say that someone goes off their rocker to mean that they become crazy. Sometimes I think he's going off his rocker.
See also: off, rocker
Collins COBUILD Idioms Dictionary, 3rd ed.

off your rocker

crazy. informal
A rocker in this expression is a concave piece of wood or metal placed under a chair or cradle enabling it to rock back and forth.
1932 Evelyn Waugh Black Mischief It's going to be awkward for us if the Emperor goes off his rocker.
See also: off, rocker
Farlex Partner Idioms Dictionary

ˌoff your ˈrocker

(informal, spoken, especially British English) (of a person) crazy: Spend a thousand pounds on a dress! Are you off your rocker?
See also: off, rocker
Farlex Partner Idioms Dictionary
See also:
  • off (one's) rocker
  • off one’s rocker
  • off one's rocker
  • off 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
References in periodicals archive
So when her husband came home from his government job one day in 1995 and announced his intentions to purchase Thunder Bay Testing, Frenette had but one question for him, "Are you off your rocker?"
"If you have to be off your rocker to be a manager at my age, then I'm off my rocker," he chuckled.
"To lend a billion, in this little country, to an individual, you have to be off your rocker."
Then there was the awful tie, This year an even bigger shocker, To wear a tie like this, Means you must be off your rocker.