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.