mumbo jumbo vs whiff-whaff

mumbo jumbo

noun
  • Any confusing or meaningless speech; nonsense, gibberish. 

  • Any object of superstition; religious words and/or actions which are seen as superstitious or fraudulent. 

  • A deity or other supernatural being said to have been worshipped by certain West African peoples; an idol. 

whiff-whaff

noun
  • The breathy sound of something rushing quickly; whoosh. 

  • Unnecessary items or additions. 

How often have the words mumbo jumbo and whiff-whaff occurred in a corpus of books? (source: Google Ngram Viewer )