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"Neckbeard" is a pejorative term and stereotype for an adult man or teenage boy (bluey) who exhibits characteristics such as social awkwardness, underachievement, or pretentiousness.[1] The term is derived from the neck beard style of facial hair stereotypically associated with young men of more introverted and cerebral dispositions, who may identify with nerd, gamer, and geek subcultures.[2]
SOURCE : https://en.wikipedia.org/wiki/Neckbeard_(slang)