Jugga-what?
Juggalo. A subculture of white morons who are fans of the Detroit-based "Insane Clown Posse", the most ridiculously stupid rap group who has ever graced the planet.
They're concentrated in Michigan but the subculture exists across the country and has been implicated in a several violent acts typically involving hatchets, machetes and group "beat-downs."
Google the term and learn more than you'd care to. But when I saw the guy's photo, "Juggalo" immediately crossed my mind.