The feeling you get when you haven't had access to the internet (i.e. facebook and twitter) for a long time, like several minutes.
> (A family is on vacation)
> Mom: Johnny, come to dinner!
> Johnny: Fucking not hungry!
> Mom (to dad): What the hell is wrong with him?
> Dad: He's got postmodem depression; he can't update his facebook status.
> Mom: But we have only been here for 15 minutes.