Snufflegun
A person who is just so ridiculously and retardedly endearing that when you see them, their cuteness is like a bullet to the brain. Essentially, someone so unintentionally adorable that you don't know how to describe them other than through a jumble of well-intended gibberish.
My new girlfriend is such a snufflegun; single people hate us because all I do is hug the shit out of her while foaming at the mouth.