Top Definition
December 21st. A holiday celebrated by AFI fans in which they reflect on the awesomeness that is winter, and AFI. Named after AFI's seventh album, and the holiday, Hanukkah. This holiday was created on the Despair Faction boards, AFI's official message board.
Happy Decemberundergroundukkah, Mark!

Hope you have a nice Decemberundergroundukkah!
by Injectacide January 24, 2009
5 Words related to Decemberundergroundukkah

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