boff vs whap

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. 

whap

verb
  • To strike hard and suddenly. 

  • She whapped down on the floor. 

  • To throw oneself quickly, or by an abrupt motion; to turn suddenly. 

intj
  • The sound of sudden blow or hit. 

noun
  • A blow; a hit; a whop. 

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