butcher boy vs slapper

butcher boy

noun
  • A male prostitute. 

  • A woodlouse, any of various terrestrial crustaceans of the suborder Oniscidea. 

  • Batting at a pitch with a short swing from a bunt position; a slash bunt, a slug bunt. 

  • A man or boy who works for a butcher shop; a butcher's boy. 

slapper

noun
  • A prostitute. 

  • A type of detonator which uses a powerful surge of electricity to vaporize a thin metal foil, propelling a larger piece of plastic film at a speed high enough to detonate an explosive upon impact. 

  • One who, or that which, slaps. 

  • A woman of loose morals. 

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