The foreskin of a nub (or noob, a person who is new and/or plays a game childlike.) Calling someone a nubskin suggests that they play so poorly, there are indeed the foreskin of the nub.
Main Entry: nub-i-kins
Pronunciation: nub-ee-kinz
Function: noun
Etymology: Alteration of English internet dialect Newb, probably from Low Patience for Eastern American "Mee too-isms"
1 : To be completely Clueless of one's situation or surroundings
2 : To be a warm and fuzzy Newb (Noob)
3 : To be horribly naive to the point of appearing retarded