How to read (transcription):
[nye v see-BYE]
(lit. – out of oneself)
1. crazy, wacko, nuts, not in his right mind
2. in a bad state, thrown off balance
Leave him, he is not in his right mind.
More from "Conversational Russian"
and in general
what are you talking about? do you here yourself talking?
short of "хорош", meaning "enough"
he is always like that
to fall asleep (fast), to collapse, to pass out
after a party with a lot of alcohol
to seek acquaintance with smb. with the expectation of an intimate relationship
back off! leave me alone!