diss vs shit talk

diss

noun
  • An insult or put-down; an expression of disrespect. 

  • Dissertation. 

  • Ampelodesmos mauritanicus syn. Ampelodesmos tenax, a reedy grass used for cordage. 

verb
  • To put (someone) down, or show disrespect by the use of insulting language or dismissive behaviour. 

shit talk

noun
  • Derogatory speech regarding someone or something. 

verb
  • Synonym of talk shit 

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