bullwhipping vs slugging

bullwhipping

noun
  • A beating with a bullwhip. 

slugging

noun
  • A blow or blows with the fist; a beating. 

  • The act of hitting a ball hard; slogging. 

  • The practice of smothering one's face with vaseline in order to moisturize it. 

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