gravity bong vs pod

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 

pod

noun
  • A nicotine cartridge. 

  • A lie-flat business or first class seat. 

  • A small section of a larger office, compartmentalised for a specific purpose. 

  • A small vehicle, especially used in emergency situations. 

  • A subsection of a prison, containing a number of inmates. 

  • A seed case for legumes (e.g. peas, beans, peppers); a seedpod. 

  • A group of whales, dolphins, seals, porpoises or hippopotami. 

verb
  • To swell or fill. 

  • To remove peas from their case. 

  • To put into a pod or to enter a pod. 

  • To bear or produce pods 

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