burger vs old hat

burger

noun
  • A hamburger. 

  • A similar sandwich or patty. 

  • A stereotypical well-off Pakistani aspiring to a westernized lifestyle. 

  • An American. 

old hat

adj
  • Very familiar; common, hackneyed or out of date. 

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