'mensch' and 'schmuck' are commonly used words in NYC that are not known to people in the South, unless they have studied German (and yes I had to fight capitalizing them.)
Another example... 'they're all' is shorthand for 'they're all gone' in Pennsylvania.
schlep too. To a much lesser extent mishegas and tsuris. There's a continuum for knowing Yiddish words where at one end it's "lived in NYC" and then passes through "had playdates with a Jewish friend" through sequentially "have 1/2/3/4 Jewish grandparents." All of these things possible anywhere in the world, but I agree very much an NYC thing.
Another example... 'they're all' is shorthand for 'they're all gone' in Pennsylvania.