Going off his rocker - Idioms by The Free Dictionary
go off (one's) rocker (redirected from going off his 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!
References in periodicals archive
This season's been a terrible shocker And the owner's going off his rocker
Our wingers are slow, they have no pace And we're bottom of the league in last place!
Dave Simpson, from Perth, thought he was going off his rocker
when he saw a TV clip of the film Quadrophenia.