cup of joe vs cupper

cup of joe

noun
  • A cup of coffee. 

  • One’s personal preference. 

cupper

noun
  • A coffee aficionado. 

  • An intercollegiate sporting competition, open to all colleges. 

  • Someone with a specific bra size. 

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