a term used by a noob to call someone a noob. Used when a noob believes he has pwned someone, and thinks that he is good he will call the person he pwned a nub.
A term that one is called when they are considered completly unbearable, totally annoying, virtually not human, or absolutely nub-tastic. The term was coined in 2013 to replace the more colloquial, but less precise terms, "fag", "n00b", and "dickhead".