Top Definition
A sometimes fatal state of god-awful sadness and defeat which occurs in the hearts of many young Homo sapiens in the few the days after Christmas morning, instigated by the realization of the fact that 364 days lie between the victim and the next Christmas break. Another cause may be the discovering that the only event to look forward to is school starting again. No cure has been found.
Mom: George, where is my other son, Harry?

George: Mom! I was just about to tell you, George has locked himself up in his room because of his extreme case of Christmas-Mourning!

Mom: Oh God. There's nothing we can do now.
by Grahamcracker5987 December 26, 2013

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