A neckbeard is growth of a beard below the jaw line in an attempt to hide the gratuitous amount of chins youre hoarding under your actual one, though everyone knows whats under that 1/8th inch of pubic hair sprawled across your throat. Often, the stunted facial hair growth is caused by low testosterone levels, typically resulting from almost no anaerobic activity and an almost constant cycle of masturbating to female dark elves while "afk". example:
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An actual beard, which, contrary to comments made in this thread does NOT require trimming, appears as such:
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