BOB vs wank

BOB

noun
  • Vibrator (device designed to stimulate a woman's genitals). 

adj
  • Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher. 

wank

noun
  • An act of masturbation. 

  • Drama, turmoil, or disagreement within a fannish space. 

  • An undesirable person. 

  • Nonsense, rubbish. 

  • Ridiculous, circular or inappropriately elaborate argument about something, especially if obnoxious, pretentious or unsubstantial. 

verb
  • To masturbate; to give a hand job to. 

  • To masturbate. 

  • To argue in an inappropriate manner or about pretentious or insubstantial matters; to engage in wank. 

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