Top Definition
A condition caused by contacting or meeting with people from "back in the day" with whom you grew up, or shared early life experiences which helped shape your personality. This can be brought on by joining Facebook and contacting some old friends, or by attending a Class Reunion of some sort. Usually VERY intense at first, wearing down over the course of a few weeks.
Man, I joined Facebook, and now I got a serious case of Nostalgic Fever.
by Kanji_Flufenoff August 22, 2010

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