A unique and distinct form of ugly. Worse than ugly, but better than ugly ugly.
Simpsons reference, from Episode #242: "Pygmoelian". pug fugly was first used by Moe the Bartender.
"I've been called ugly, fugly, pugly, pug fugly... but not UGLY ugly!"
A person so ugly, he or she not only looks like they are millions of years old, but is the king of these million-year-old ugly motherfuckers that somehow still live in today's society