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A phrase used to indicate ambiguous and eternal duration, usually for a problem. Equivalent to "since the beginning", "always", or "at the get-go". It is a somewhat comedic reference to the continual state of war that the USA has been in for as long as anyone has been alive.
Sam: Fred, how long have you had all these strange food allergies?
Fred: Since the war. I don't ever recall being able to eat peanuts.
by madric November 09, 2011