not right in the head vs psycho

not right in the head

adj

  • crazy, insane 

psycho

adj

  • Psychotic or otherwise insane. 

noun

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

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

  • A person who is psychotic or otherwise insane. 

How often have the words not right in the head and psycho occurred in a corpus of books? (source: Google Ngram Viewer )