crown jewels vs klackers

crown jewels

noun
  • The male genitalia. 

  • The jewelry that accompany the office of rulership in a monarchy, i.e. crown, scepter, signet ring, etc. 

klackers

noun
  • A fad toy of the 1970s, consisting of two hard balls connected by a single string. 

How often have the words crown jewels and klackers occurred in a corpus of books? (source: Google Ngram Viewer )