be off your rocker
idiomPart ofrocker
be off your rocker — idiom
1. If someone is off their rocker, they are acting in a very strange or foolish way
1.idiom
Definition
If someone is off their rocker, they are acting in a very strange or foolish way.
Example
My neighbor must be off his rocker to paint his house purple.
Are you off your rocker? You can't swim in that river!