hip-hop vs slap on the wrist

hip-hop

verb
  • To move by hopping or with a hopping motion. 

  • To perform hip-hop music. 

noun
  • An Afro-American urban youth culture based on rap music, breakdancing etc. 

  • A form of popular and dance music featuring strong percussion and a powerful rhythm, usually accompanied by rapping. 

slap on the wrist

verb
  • Used other than figuratively or idiomatically: see slap, wrist. 

  • To punish in an overly mild and largely symbolic manner. 

noun
  • Used other than figuratively or idiomatically: see slap, wrist. 

  • An overly mild punishment; a reprimand. 

How often have the words hip-hop and slap on the wrist occurred in a corpus of books? (source: Google Ngram Viewer )