1.)To take or demand something that you don't own or have any rights to in anyway. Usually done by threat of force, violence, or future retaliation. Often times aided along by the help of a big gun.
2.)To scream and shout until you get your way even though your way maybe wrong, unjustified or just plain stupid.
1.)Do you believe Tyrone justed nig-ed out on that guy and jacked his car?
person1: "No you cant make a right here, you have to make 4 left turns!"
person2: "Why?!? thats retared!"
person1: "just do it because i told you to!"
person2: "OK fine take it easy just don't nig out on me again."