chocolate channel vs keister

chocolate channel

noun

  • The anus or rectum, especially as a sexual orifice. 

keister

noun

  • The anus or buttocks. 

  • A suitcase or satchel. 

verb

  • To conceal something in one's rectum 

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