"Hatnub" means to hate a n00b.
Note: you do not call someone a 'hatnub', but you may say 'hatnub' to someone, to descibe your feelings towards them.
del: I played WoW until 5am :(
"Hatnub" should be used to express your lack of tolerance/extreme annoyance of noobs (amateurs).
Iez: Dude, how do I write a letter in MS Word?
Del: Right, get out of my house now. I actually hatnubs ->