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1.
Someone who is overly obsessed with Disney in any way and knows too much about hidden things or facts about the parks. Someone who is always in the know about everything Disney.
*strolling around Disneyland* "Oh my God here comes a disneyatic..."

*sees someone adorned in Disney gear and Disney Pins, pointing out random things and talking about its history*
by anglofinnocents May 03, 2010