Quoting The Doctor:" Newb- New member. Maybe just doesn't know the way around the site, the abbreviations, etc. Noob- Doesn't matter how long you've been here, someone is insulting you."
Quoting Derpy the Duck:" Post count and how long you've been around the site. Like for example, I wouldn't call you a noob but someone who's been here a month and has 300 posts I would. Make sense? "