barn dance vs slam-dance

barn dance

noun
  • A type of set step routine dancing, such as square dance. 

verb
  • To take part in barn dancing. 

slam-dance

noun
  • A form of dancing where participants intentionally collide. 

verb
  • To dance in this style. 

How often have the words barn dance and slam-dance occurred in a corpus of books? (source: Google Ngram Viewer )