"UNC is a slang term actively used by Gen Z meaning “uncool” or “uncle”. The word is used to describe other individuals as out of touch with modern times, not acting in accordance with current times/keeping up with current trends, norms or social scripts.
"NPC" is a slang term actively used by Gen Z meaning “Non-Playable Character”. The term is used to suggest that another individual is perceived as generic, predictable, and lacking originality, unable to form thoughts or opinions of their own. This is sometimes illustrated with a grey-faced, expressionless version of the Wojak meme.