A person whom is specifically defined by the girth, length and prominence of their chin. Often an indication of sexual prowess or excessive testosterone.
Usage: Sure, i mean your dick is big, but 'bout that chin though?
"Wow, he's 16 and has such a massive chin. What a Chin Guy"
"I shaved my beard down so im more of a ChinGuy"
@7as - Discord Daddy.