Top Definition
1) Diarrhea of the mouth caused by a high level of arrogance from overexposure to pinstripes.

At the present time, there is no cure for Yankeeolia. Symptoms include rampant bragging, loss of reality and constant reference to past events which have no barring on the present. It is advised that contact be avoided with an individual infected with this disease as it is very contagious and can cause brain damage. Yankeeolia can effect any man, woman and child. It luckily has not been detected in domestic animals

2) An abnormally high level of arrogance associated with exposure to pinstripes that often leads to rash behavior, diarrhea of the mouth and an inability to consume alcohol safely after the 7th inning
At the Subway Series game yesterday at Citi Field, a Yankee fan with a major case of Yankeeolia picked a fight with about 7 Mets fans.
by rapaddict40 October 06, 2010

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