The phrase "went rocker" is an informal way of saying someone went crazy. Synonyms for this phrase include "lost it," "flipped out," "went mental," "went off the rails," and "had a breakdown." These phrases are often used to describe situations where a person suddenly becomes emotionally overwhelmed and acts in an irrational or destructive manner. While some may use these terms as a way to make light of a serious situation, it is important to remember that mental health is a serious issue that affects many individuals and should be treated with sensitivity and understanding.