bean flicking vs pocket pool

bean flicking

noun
  • Manually stimulating one's clitoris; female masturbation. 

pocket pool

noun
  • The act of manipulating one's genitalia through a trouser pocket; masturbation. 

  • A variation of the game of pool. 

How often have the words bean flicking and pocket pool occurred in a corpus of books? (source: Google Ngram Viewer )