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wikipedia has a clean article on the subject of juggalette and defines one as:
Juggalette (more commonly used for a female) is a member of the group that has grown up around the fanbase of the Michigan rap/horrorcore group Insane Clown Posse (ICP), and related recording artists at Psychopathic Records. Much of the predominant philosophy of the group stems from the Dark Carnival, a mythology that was carried as a theme in six ICP albums known as the 6 Joker's Cards.