gammy vs nana

gammy

noun

  • Grandmother. 

  • A blowjob; fellatio. 

adj

  • Injured, or not functioning properly (with respect to legs). 

nana

noun

  • One's grandmother. 

  • A nanny. 

  • A banana. 

  • A foolish person. 

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