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1.
A holiday that coincides with our Christmas. It is celebrated in Free Country USA. On Decemberween, everybody sits down to enjoy a feast of bunny, (except Marzipan) and everyone gives gifts to each other(ideally Deep Impacts).
2001=The best/worst Decemberween ever.
by Daniel December 23, 2003
 
2.
A holiday made in Homestar Runner cartoons that occors in December when trees are decorated and gifts are exchanged.
This is the worst Decemberween Ever.
by Todd July 16, 2003