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Taken from the National Lampoon Christmas Vacation movie.

(Noun) - Someone who gets possessed by the Christmas Spirit and enjoys it a little too much

(Verb) - its the act of getting way too into Christmas, including decorating your house in an obscenely obnoxious way or traveling out to the middle of no-where to cut down an oversized Christmas tree.
John realized he went Clark Griswold on his house when he could see the lights from across town.
by mildmanneredclarkkent December 01, 2009