A rare disorder principally characterized by an unwarranted affinity for Philadelphia, its sub-par sports teams and/or WaWa. No known cures exist, and symptomatic individuals have to be shot. Or crucified. Probably shot.
John: Don't you agree that the Red Sox is the best team in baseball?
AC: No, the Phillies are better, even though they have the most losses in MLB history.
John: You, ma'am, suffer from Phillyphilia.