noon vs top shelf

noon

noun
  • The highest point; culmination. 

  • The letter ن in the Arabic script. 

  • The time of day when the sun is in its zenith; twelve o'clock in the day, midday. 

verb
  • To relax or sleep around midday 

top shelf

noun
  • The upper part of the goal. 

adj
  • Best, or high quality. 

  • Describing books, magazines, or movies that have adult content or softcore pornography. 

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