The Brief: A "neckbeard" is a stereotype of a nerdy, unkempt man who spends excessive amounts of time on his computer.
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The term refers to having a beard that extends to the neck, usually an indication of incomplete grooming. Other attributes of a quintessential neckbeard are that he is over 30, antisocial, plays video games, and is active on internet forums like Reddit and 4chan. Neckbeards are often associated with internet trolls as well as internet-based subcultures like incels bronies, and anime fandoms.