bailer vs gravity bong

bailer

noun
  • A utensil, as a bucket or cup, used in bailing; a machine for bailing water out of a pit. 

  • One who bails or lades. 

gravity bong

noun
  • A homemade device used to smoke marijuana, consisting of a plastic jug with the bottom cut out and immersed in a vat of water, which is then raised to create a vacuum beneath its bowl of lit marijuana. 

  • Synonym of waterfall bong 

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