BOB vs jerk off

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. 

jerk off

noun
  • An act of masturbation. 

  • A stunt in which the performer is suddenly pulled off a horse, etc. by means of a cable. 

  • An annoying person. 

verb
  • To deceive. 

  • To masturbate, usually a male. 

  • To do nothing; to waste time. 

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