defecation vs shitting

defecation

noun
  • The act or process of voiding feces from the bowels. 

  • Any of several processes for the removal of impurities, or for clarifying various materials. 

shitting

noun
  • The act of defecating. 

adj
  • An intensifier, often applying more to the whole utterance than to the specific word it modifies; same as fucking. 

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