A definition similar to noob or n00b, who is someone who does not know anything about a topic. A nub is someone who has been doing something for a while and has had the opportunity to learn it, and they usually claim they know a lot about the topic, but they still don't know much about the topic.

another word for newbie used by skilled people who play counter-strike

a small penis

Military (particularly US Navy) acronymn for Non-Useful Body.

an acronym for an unqualified submarine sailor
n-non
u- useful
b-body

one who isn't a noob (played a game for some time), but plays like one

to manbir a sidhu, to be a complete waste of space