The sick feeling you get in your stomach when you realize it's no longer Christmas. Usually begins the second you open your last present and is worse depending on how excited you were on Christmas Eve.

Symptoms include: forgetting what presents you even got, sickened feeling, tiredness, depression, ect.
As soon as Sally opened her last present, she went in her room and slept. The poor girl's Christmas Hangover lasted a week.
by XKittyXKat December 14, 2010
The day after Christmas, December 26th when you wake up realizing all the fun is over and you have to wait another 365 days until Christmas.
Man Wakes up. "Oh Come on 364 more days till christmas. I have a serious Christmas Hangover."
by christmaself1234 December 15, 2009
The slight depression some people experience for up to a week after Christmas is over-it is caused by all the excitement of christmas suddenly being over.

The most common age group of people that suffer from Christmas Hangover is around ages 8-13, however, there have been other reported cases.
Once he realized that there was no more presents to open, and that he had to go back to school, Paul was suffering from severe Christmas Hangover.
by CalebD December 24, 2009
When you have eaten to much ham, turkey, Christmas pudding and drank too much alcohol and you wake up on Boxing day feeling bloated and hungover

Also when you've spent all your money on Christmas presents / food...etc... and can't afford to do anything, so you just lay about the house doing nothing
man I ate and drank too much yesterday and I'm suffering from a christmas hangover!

After buying my niece and nephew x-box games and my wife a diamond bracelet and all that food for the big day, I'm suffering from a christmas hangover!
by Old Saint Nick December 26, 2013
When you drink so much egg nog you get drunk,pass out or both.
Dude 1:(see`s dude 2 on floor)

Dude 1:Hey man what happend?

Dude 2:It was..............(he passes out)

Dude 1:Oh I get it, Christmas hangover (looks around then starts tea bagging him)
by Mastercheif144.32 December 25, 2011

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