A nurb is someone so noobish that not even a narb will satisfy the need. Nurb is an obscure way to call a noob annoyingly funny without actually saying it.
This word describes a lot of stuff. A noob, a shoe, a cool person or a Macki. Now, the forth is the most dangerous one. The king of nurbs is known as Macki.
Ganxsta: a person who talks shit about someone behind their back and sucks up to them to their face. Also spends all day inside on the computer or playing video games. Also see fag or nub.