psycho vs screw loose

psycho

noun

  • A person who is psychotic or otherwise insane. 

  • A person who acts in a bizarre or dangerous manner. 

  • A class, at a college or university, in which psychology is taught. 

adj

  • Psychotic or otherwise insane. 

screw loose

noun

  • A state of insanity or eccentricity. 

How often have the words psycho and screw loose occurred in a corpus of books? (source: Google Ngram Viewer )