"Went wacko" is a colloquial term that describes a state of extreme and erratic behavior. It can also be referred to as going nuts, losing one's mind, or becoming unhinged. Some synonyms for this phrase include having a meltdown, flipping out, going berserk, or going bananas. Other ways to describe this behavior could include becoming irrational, hysterical, or losing control. It is important to note, however, that while these phrases may be used casually, they should not be employed to diminish the seriousness of mental health issues. If you or a loved one is struggling with extreme and erratic behavior, it is important to seek professional help.