knackwurst vs tube steak

knackwurst

noun
  • A highly seasoned scalded sausage made from beef, pork, and fatty tissue similar to a frankfurter, but shorter and thicker. 

tube steak

noun
  • A frankfurter/hot dog. 

  • A penis. 

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