offy vs pony keg

offy

noun
  • An off break. 

  • An off-licence. 

  • An off spinner. 

pony keg

noun
  • A container for beer holding 7.75 US gallons, equal to half the size of a standard beer keg. 

  • A drive-through liquor store; by extension, any convenience store. 

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