gob vs spit roast

gob

verb
  • To spit, especially to spit phlegm. 

  • To pack away waste material in order to support the walls of the mine. 

  • To gather into a lump. 

noun
  • The mouth. 

  • A sailor. 

  • A whoopee pie. 

  • A lump of soft or sticky material. 

  • Waste material in old mine workings, goaf. 

  • Saliva or phlegm. 

spit roast

verb
  • To engage in the sexual practice called a spit roast. 

  • To roast meat in this way. 

noun
  • A sexual practice whereby two men service a single sexual partner at the same time, from different ends. 

  • The technique of roasting an animal, such as a pig, over a fire, where the cook sticks a wooden/metal rod through the animal and sets the ends on two sticks to suspend the animal over the fire. 

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