n00b = A person that does not follow the rules, who spams. Not to ne confused with newb, which is a new member. Anyone can be a n00b, no matter how long they have been on a website.
btw = by the way
Uber = I'm pretty sure this is adapted from german or something, it means something along the lines of supreme, the best, but can be used as a negative such as having an Uber team of pokemon, like all legendarys.
Flaming = Swearing at someone, or just insulting some one in general. Such as calling someone a moron.