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 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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