The morning after a party when you feel bad about drinking so much and fear things you've said or done could have upset someone or was just plain embarrassing.... on top of being extremely hungover.
Ugh, last night's party was insane. Why do I have 10 missed calls, and wtf - all these texts. I'm going back to bed, fuck this PPD - post party depression.
That feeling you get when leaving the theater after watching Harry Potter and the Deathly Hallows Part 2. You can also receive PPD from finishing the last novel in the Harry Potter series but this wasn't as bad because you always had the option of waiting for the movie to come out.
Guy 1: (upon exiting the movie theater) Dude, that Harry Potter movie was epic! I can't wait for the next one to come...oh.
Five days later
Guy 2: What's wrong with Guy 1, he hasn't been himself lately.
Guy 3: He's suffering from Post Potter Depression (PPD), last night he tried to kill himself by shouting Avada Kedavra and pointing a twig at his face.