Off One's Rocker Meaning
(idiomatic) Crazy; insane.
Example: He's off his rocker if he thinks he can tackle the whole thing alone.
1960, P. G. Wodehouse, Jeeves in the Offing, chapter VIII:
â€œBertie! Your manner is strange.â€ â€œYour manner would be strange if you'd been sitting on the floor of Wilbert Cream's sleeping apartment with a chair round your neck, and Ma Cream had come in.â€ â€œGolly! Did she?â€ â€œIn person.â€ â€œWhat did you say?â€ â€œI said I was looking for a mouse.â€ â€œCouldn't you think of anything better than that?â€ â€œNo.â€ â€œAnd how did it all come out in the end?â€ â€œI melted away, leaving her plainly convinced that I was off my rocker.â€