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.
by Lie_Detector_411 June 17, 2010
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Unlike the previously mentioned in Urbandictionary 'postmodem depression' which is the feeling you get when you haven't had access to the internet for a long time, like several minutes. Postmodem bipolar depression is the feeling you get when your internet connection keeps going off: when it's up you feel happy and excited; when it's down, you feel sad, lonely and helpless. This can happen several times in a day.
I haven't seen your sister for days: I've heard she's suffering from postmodem bipolar depression.
by timidmoon November 22, 2010
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