The phrase "go ones rocker" is an informal idiom that means to become insane or crazy. There are several synonyms that can be used to express this idea, such as "lose one's mind", "go out of one's mind", "go crazy", "flip out", "go off the deep end", and "lose it". All these phrasal verbs indicate a sudden eruption of a person's mental faculties, where he or she can't control the emotions and starts behaving in a mad and irrational way. These synonyms portray similar meanings to "go once rocker", but with different connotations, and they can be used interchangeably to express mild to extreme mental instability.