Similar to a hangover, but the main cause is instead, a concert. Experienced the day after a concert with symptoms such as: headache, loss of hearing, sensitivity to light, loss of voice, sore throat, soreness, etc. Normally goes away within a day or two.
Guy 1: Didn't you go to that Green Day concert last night?
Guy 2: Yeah it was good, but I'm having the worst concert hangover.
Guy 1: Oh, that's too bad...