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.
Postmodernism is the ultimate lubricant invented by social sciences in order to fuck every concept and structure that humans ever came up with. At the same time it is used as a means for social sciences to penetrate one another.
Anthropology put some postmodernism on its cock and managed to penetrate History so deep that it screamed...then it turned towards Political Science, which fainted immediately.
A term that you keep on hearing about in college and have to look up on Wikipedia. Basically says "fuck it" to the search for any intellectualconclusions.