Someone epicly noobish. Epuh derived from epic. Nub derived from noob. Noob derived from newbie. Epuhnub is a way to say epic noob in one word.
Other forms: Epuhnoob
"Man haloking032 is a epuhnub. He can't even snipe at point blank range!"
"He is so new to online gaming that he's an epuhnub."