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When there is an alarmingly large gathering of hicks and/or rednecks. So many, that it appears as though they are taking over the world.

Much like the feared zombie apocalypse, but with hicks/rednecks instead, which is much more frightening.
Citizens: "Hide yo kids, hide yo wife, and hide yo husband, THE HICKOCALYPSE IS UPON US!"

Hick/Redneck: "YEEEEEEHAAWWWW!" *runs over citizen with truck*
by Miss. D. Meener March 26, 2011
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