It's when you're sad because Christmas has passed, and you know that you're going to have to wait almost a year before the next time you get free stuff other than your birthday.
Bro 1: "You don't look so hot, are you okay?"
Bro 2: "Yeah, just post Christmas depression is all."
Bro 1: "Oh yeah, now that you've reminded me, I'm also suffering from PCD..."
by Clemens Hemmingway December 5, 2010
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That period of time, usually following New Year's, when you must take down all Christmas decorations and as a result, your house feels cold and naked.
John: Aw man... that spot by the fireplace where the Christmas tree used to stand feels so empty now.
Bob: Yeah, you're suffering from Post-Christmas depression. We all get it.
by TheSantaClaus December 24, 2011
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After opening presents on christmas day, being very excited about a certain present and stay up all night using it.
Jon looked like a rabid squirrel after Christmas due to post Christmas insomnia. He got no sleep. Later he passed out in his mother's bed.
by Hello Satan December 26, 2009
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A popular, yet unheard of holiday tradition that usually takes place the night of Christmas or at any point in time on the day after Christmas. In this tradition, one locks his or herself in a bathroom for an unusually large period of time and painfully excretes all holiday fruitcakes consumed over the past few days. This tradition is a wonderful way to say say goodbye to the Christmas season and to prepare your bowels for the upcoming new years.
Brian: That was a great Christmas season. Best Christmas ever!
Jimmy: Yeah it was! But now it's time for the Post-Christmas Dumping. See you in a couple hours.
by TheDirtyHoodelum December 26, 2014
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The act of returning shit from the holidays that you will not wear or use because it is ugly, cheap, a regift, ect.
"Wow looks like the christmas cheer got to jamie"

"No i think its just because she doesnt wear new clothes so she gets a lot of post christmas green"
by name that hasnt been used December 29, 2010
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Usually occurring on or after December 26th, when all of the Christmas festivities come to an end and you have nothing to look forward to except for a long, cold, boring ass winter.
Tom suffers from Post Christmas Depression (PCD) every year right from the time when he opens his last present on Christmas Morning up until Black Friday of the next year.
by Taylor the Terrible December 24, 2008
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The overwhelming feelings of anxiety and panic that insue upon waking the day after Christmas. Typically related to buyers remorse, over eating,empty bank account and the pile of dirty dishes waiting to be washed in the kitchen.
Jamie: " Amy I don't know what to do! I've put on 10 pounds, my kitchen is a mess and I checked our bank account on line and we're in overdraft! To make matters worse, the Kindle Fire I paid $250.00 for is on sale...... half off!"

Amy: " Damn girl, you better call a shrink. Sounds like your suffering from Post Traumatic Christmas Disorder."
by cheer1 December 27, 2012
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