A person who is psychotic or otherwise insane.
The loony bin up on the hill is full of psychos.
A person who acts in a bizarre or dangerous manner.
She complained that he was a psycho for driving at such a high speed in heavy traffic.
Psychotic, or otherwise insane.
A class, at a college or university, in which psychology is taught.
I've got anthro, socio, lunch, and psycho.