The state of going so far insane no one wants to be associated with you. A dangerous State of existence where you might be sent to a mental institution. If you go Third Dragon there is no going back, and everyone will remember.
The first usage of going Third Dragon was in reference to a girl who thought see was possessed by three different dragons.
Guy 1 "NO dude don't do it! Don't go Third Dragon!"
Guy 2 "yeah man i had an ex that went Third Dragon... we aren't together anymore."