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An acronym meaning the New York, and North New Jersey area. More realisticly, it stands for Manhattan and a few select New Jersey cities with close proximity to Manhattan (Hoboken, Englewood, Cliffside Park, Fort Lee, Edgewater, Paramus, etc).

While also the same as the New York Jets (a NFL team), this is NOT what this means in this context!
Chick A: "I hate traffic in NYJ, it's quite obnoxious!"
Chick B: "I know right, we should more to Cali or something!"
Bro: "This sandwich ain't gonna make itself!"
by infamous_buff_chix January 22, 2012