A n00b is defined by the infinite wisdom from the user FryDog who manages Team Dank in the USA league. The definition of a n00b is any user who manages a team that has not been in division III for more than 2 consecutive seasons without demoting.
A n00b should not be confused with a newbie. Whereas all newbies are, by default, n00bs; all n00bs are not necessarily newbies.
Please note: this article is very much an inside joke for those who read Hattrick's US conference board. Pity if you don't get it, but don't assume others won't. Wiki on now...