1. Facial hair growing on the neck but not on the face
   "His neckbeard made him look unkempt"
    
2. A socially awkward, unattractive man, stereotypically associated with poor grooming habits and obsessive interests in technology or geek culture
   "The forum was full of neckbeards arguing about obscure sci-fi trivia"

Derived forms: neckbeards

Encyclopedia: Neckbeard