A staightforward, candid way of perceiving and communicating: friendly, {gregarious}, helpful, possibly in a hurry. Bullshit filters develop as a New Yorker matures, protection against the overwhelming, {ubiquitous} flood of endless words and images. Some N.Y. responses may sound {brusque} but it's a means of budgeting time. Being expedient.
The pedestrian and traffic patterns are as schooling fish; no one stays in a traffic lane and everyone moves at their own pace. New Yorkers are within reach of the best restaurants, finest museums and richest cultural activites, and they know that most out-of-towners are not. They're perceived as being cocky know-it-alls, people with a New York Attitude.

A secondary meaning is, it's used as code for Jewish culture, "behavior" "imtellect" and whatever other {stereotype} with which they choose to refer to one-quarter of New York City's population