aftertale vs nastygram

aftertale

noun
  • Evil talk; slander; defamation. 

  • A postscript added where a story should end. 

  • A postscript added to the end of a story. 

nastygram

noun
  • A written communication containing unpleasant material, especially one that criticizes, insults, or intimidates the recipient. 

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