Off your rocker

Meaning

Crazy or irrational.

Usage

Informal insult for erratic behavior.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Rocking chairs rocking too far cause one to fall off.

American slang from the 1920s.