Hand Solo vs pocket pool

Hand Solo

noun
  • An act of masturbation involving the manual stimulation of one's own genitals. 

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 Hand Solo and pocket pool occurred in a corpus of books? (source: Google Ngram Viewer )