A fork of Rural Dictionary
For all the tards out there that use this term loosely, or explain at length how it "originated in online gaming" - whatever. "Nub" is a Navy submariner term for those who are new to the sub and don't know how to do anything yet (and thus unqualified in submarines) Thus "nub" means "non-useful body" get it right, or don't use it.
Dude, he didn't know how to do that, he's still a nub.