Post Holiday Depression (PHD) : General feeling of sadness and depression and hatred of all things work-related soon after a long holiday. Symptoms usually show at least 4 hours into the first work day after a holiday and can linger for up to a year until the next festive season.

No known deaths have have recorded due to PHD, but severe cases of office in-fighting, bickering, and crying have been noted in the IT industry soon after New Years.
Sue came back from the Cape Town with a severe case of Post Holiday Depression and refuses to send those invoices!
by Dr I. H. Work January 26, 2010
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The syndrome you have when you have gone through a holiday and no longer have a functional daily rhythm. A person with a Post Holiday Syndrome will then be awake at night and sleep at day. It may be in relation to the heavy partying a lot of people do when on holidays.
Guy: "Dude, I can not possibly go to school now! I haven't gone to bed before 3:00 AM in the last 2 weeks! All this partying has been killing me!"
Dude: "You're not the only one with a Post Holiday Syndrome..."
by Stian Christer Pedersen August 17, 2007
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A feeling of depression or overall melancholy when the Holiday season has passed, having to go back to work and/or school is a major factor in Post-Holiday hangover symptoms.
John: "Hey, do you know where Phil's at?"

Susan: "Ah, he told me he was calling in sick today. post-holiday hangover got the best of him, I suppose."
by venom5517 January 3, 2011
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The time between the holidays and your next pay-cheak when you don't have any money
Bob: Hey Joe! Wanna go out for dinner?
Joe: No, I'm still in Post Holiday depression until next week.
by Arrrrrrrrg January 2, 2009
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When one becomes depressed as the fun of the holidays comes to an end and everyone has to return to their boring, everyday lives.

Often goes hand-in-hand with christmas tight.
Bob: "What is Steve's problem?"

Sue: "I think he has a severe case of Post-Holiday Depression (PHD). I heard him crying when his co-workers in the next cubicle were talking about their holiday vacations.
by hahaidontgetit December 28, 2010
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