N.J. is the abbreviated phrase for Nigger Jew.
1. It is sometimes used as an informal greeting or general banter among friends without malicious intent.
2. It can also be used as an insult to anyone from blacks to jews.
Stop being such an enj and shut up.
Some enj just stole my rims!
This enj just tried to sell me crack.
That enj is on his way to the synagogue