boff vs slugging

boff

noun
  • A hit or smack. 

  • A great success; a hit. 

  • A pupil who works hard; a swot. 

  • A line in a film etc that elicits such a laugh. 

  • A big laugh. 

verb
  • to have sexual intercourse (with someone) 

  • To hit; to strike. 

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 boff and slugging occurred in a corpus of books? (source: Google Ngram Viewer )