3.someone who is not mentally stable and usually in most cases kills for a living.
wow that boob job is psycho bad!
did you hear about that psycho on the news who killed all those people and hid them under his house?
b) Alfred Hitchcock horror masterpeice psycho (1960) accredited with signifying the birth of the slasher movie
c)a psychobilly someone affiliated with psychobilly culture, fashion and music
b) have you seen psycho, Norman Baites kills his mum
c) he killed his mum and has a flat top, he must be a psycho