"Go off one's rocker" is an idiomatic expression that means to lose one's mind or to become crazy. There are many synonyms for this phrase that can be used interchangeably, such as "go bonkers," "go insane," "lose it," "flip out," "lose your marbles," "go bananas," "go haywire," "lose one's cool," "go berserk," and "lose one's grip on reality." All of these expressions convey the same meaning as "go off one's rocker" and can be used in different contexts and situations to describe someone who is losing their mind or acting irrationally.
