boff vs spank

boff

verb
  • To hit; to strike. 

  • to have sexual intercourse (with someone) 

noun
  • 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. 

  • A hit or smack. 

spank

verb
  • To hit very hard. 

  • To move rapidly. 

  • To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, gesture, or form of sexual interaction. 

  • To soundly defeat, to trounce. 

noun
  • A slapping sound, as produced by spanking. 

  • An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap. 

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