After seeing your favourite singer(s) play live, you might get PCD, post concert depression. Not cause they weren’t what you were expecting, but cause you saw your idol just a few feet in front of you, and you realise you might never see them again. (Lazy description of it)
Person A: what’s up with B?
Person C: they saw Twenty one pilots yesterday.
Person A: why are they still crying?
Person C: PCD
Person A: what’s that?
Person C: post concert depression.