12 vs piggy

12

noun

  • Collectively, police or law enforcement. 

  • See also: fuck 12 

symbol

  • Used by fans of American football, positioning themselves as the 12th member of an 11-player team. 

piggy

noun

  • A member of the police. 

  • A toe. 

  • A pig, a greedy person. 

  • A pig (the animal). 

  • A guinea pig. 

adj

  • slovenly, dirty 

  • greedy 

How often have the words 12 and piggy occurred in a corpus of books? (source: Google Ngram Viewer )