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1.
The act of touring through various neighborhoods searching for garish, tacky or otherwise 'over-the-top' holiday displays.

A reference to the family name, Griswold, of the characters from the National Lampoon film series; most notably the National Lampoons Holiday Vacation.
We loaded up the minivan with the kids and the camcorder and headed out Griswolding.
by Barry Seetoo-Ronk December 21, 2006
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