* Mentally unstable or erratic: This is the most common meaning. It suggests someone who is acting irrationally, impulsively, or in a way that is out of character.
* Out of control: It can also describe someone who is behaving in a wildly chaotic or disruptive manner.
* Over the edge: This implies that someone has lost their grip on reality and is acting in a way that is extreme or dangerous.
For example:
* "After the breakup, she went completely unhinged and started posting crazy things online."
* "The crowd was unhinged during the concert, jumping and screaming wildly."
* "He's been acting so unhinged lately; I think he needs professional help."
Note: While "unhinged" can be used in a humorous way, it generally carries a negative connotation and implies a lack of control or sanity.