nang vs spiffing

nang

adj
  • excellent; awesome; masterful; deeply satisfying. 

noun
  • A metal bulb filled with nitrous oxide gas, inhaled for its disassociative effects, normally intended as a propellant for whipped cream. 

spiffing

adj
  • Very good, excellent. 

  • Smart or appealing in dress or appearance. 

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