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!
*off one's rocker
and *off one's nut; *off one's trolleyFig. crazy; silly. (*Typically: be ~; go ~.) Sometimes, Bob, I think you're off your rocker. Good grief, John. You're off your nut.
off one's rocker
Also, off one's nut or trolley . See off one's head.
off your rocker
INFORMALIf 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.
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.
ˌoff your ˈrocker
(informal, spoken, especially British English) (of a person) crazy: Spend a thousand pounds on a dress! Are you off your rocker?off one’s rocker
mod. silly; giddy; crazy. (see also rocker.) That silly dame is off her rocker.
off (one's) rocker
Slang Out of one's mind; crazy.