A juggalo is a person who often listens to bands such as ICP and/or bands which fall under the same record label Hatchet (Psychopathic Records).
Some members of the group are known for the makeup they wear which resembles Corpse Paint, a common staple in black metal music and clown facepaint.
"Hey man, did you see the Juggalo?"
"Yeah, I did. Pretty rockin' face paint they have."