neckbeard

/N EH1 K B IH1 R D/
noun
  1. 1

    A style of facial hair wherein the beard is allowed to grow down the chin and is trimmed to an even length over the entirety of the face.

  2. 2

    A self-important, socially inept nerd. (Compare fedora.)

Source: https://en.wiktionary.org/wiki/neckbeard