clacker vs keister

clacker

noun
  • The anus. 

  • Any device that makes a clacking noise. 

  • A percussion instrument that makes a clacking noise. 

keister

noun
  • The anus or buttocks. 

  • A suitcase or satchel. 

verb
  • To conceal something in one's rectum 

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