SM vs thrashing

SM

symbol
  • service mark 

thrashing

noun
  • A heavy defeat. 

  • Threshing. (of cereal crop, etc) 

  • Action of the verb to thrash. 

  • Excessive paging within virtual storage. 

  • Slam dancing. 

  • A beating, especially a severe one. 

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