American Slang Words #5." Noob" Noob is a slang used to refer to an individual who is inexperienced or lacks skill in a game, hobby, or activity. It can be utilized either to describe someone who lacks experience in a particular field or as an insult to demean or ridicule a person for their lack of knowledge or skill. Ex: Do you really know how to play the game?! I don't wanna party with you! You're such a noob!