Zip vs jack mackerel

Zip

noun
  • A Sicilian or Italian Mafioso who is relatively new to the United States. 

jack mackerel

noun
  • Any of various edible fish, especially of genus Trachurus, but also genera Caranx, Acanthocybium and Euthynnus. 

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