A form of neckbeard; the pube looking hair on Naruto fan's necks and chins. Can apply to any body who has this type of beard and in fact isn't a beard but scraggly pubes on ones chin or neck.
Usually accompanied with an awful BO.
Also, the only word to rhyme with purple ever.
"Jake did you see Johny's neckbeard?"
"Yeah, it's more of a durple though."