Neck beard refers to the guys that all their beard to grow from the top of their chest all the way to their cheek bones. They basically don’t shave their beard from the jaw line/chin down their neck.
Neckbeards are also synonymous with unshaven unwashed millennial and zoomers who just let themselves go while living in filth aka the neckbeard lair with fast-food, pizza and energy drinks littering the place around the gaming console and computer. They are almost always involuntary celibates as in no woman would be with them.physically without payment hence the AMPs this guy was probably so gross even the poor sex slave AMP girls said nope and he went full black pill and lost it.