The Morning News did a great piece last year on New York jargon that I ran into recently. If you don't relate to it, you probably don't live in New York. I know I personally hit at least two of these issues every day.
Metrotard (noun): A person in front of you at the subway turnstile who can't figure out how to swipe his or her subway pass. Also: A person who tries to use a Metrocard to withdraw money from an ATM.
