Also known as PCD, it is the depression after your favorite band or singer's concert. You feel like you miss them a lot even though they don't know you, and you don't know what to do with your life because your life is so boring out side of a concert. Sometimes, symptoms are so bad that you cry a lot, can't eat anything, and don't talk to anyone. A lot of the time you'll be looking at the pictures or videos you took at the concert or watch other people's recordings on YouTube.
Hey, Susie, you look really sad. Didn't you have a good time at the concert you went to last night?
Nah, man, leave her alone. She must be suffering with post concert depression.