Decemberitis is a late NFL season disease that affects the Wade Phillips Dallas Cowboys during the month of December. Symtoms include, inability to complete passes, chronic interception syndrome, being sacked multiple times, random loss of hand-eye coordination in clutch situations, poor performance in the playoffs, and general embarrassment in the eyes of the local media.

There is no known cure and those who suffer from Decemberitis are doomed to a career of mediocrity.
After a pitiful display by the 2009 Dallas Cowboys and the lack of production during the 2010 season in the month of December, it appears that there is still no cure for Decemberitis.
by Solblackguy2827 December 10, 2009
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Also applies to Wade Philips coached Rams, Jason Garrett coached Cowboys.
Coach Clapper can't escape decemberitis.
by 4th and Jawn December 21, 2018
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Decemberous meaning is used to call Someone selfish or rude cold hearted
YOU ARE SO DECEMBEROUS
SHE/HE/THEY/IT IS SO DECEMBEROUS
by Confuseotherswithmywords December 28, 2022
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