ching vs rock cocaine

ching

noun
  • Cocaine. 

  • A pair of small bowl-shaped finger cymbals made of thick and heavy bronze, used in the music of Thailand and Cambodia. 

  • Money (from the sound of a cash register ringing up an amount). 

  • A ringing sound, as of metal or glass being struck. 

  • A high-pitched mating call made by the male kakapo. 

  • A knife. 

verb
  • Of the male kakapo: to make its high-pitched mating call. 

  • To chink or clink; to make a ringing sound, as of metal or glass being struck. 

  • To stab. 

intj
  • The sound of metal or glass clinking. 

rock cocaine

noun
  • The off-white, crystal-like form of crack cocaine. 

How often have the words ching and rock cocaine occurred in a corpus of books? (source: Google Ngram Viewer )