Top Definition
1.To exhibit a strong sense of pride that is largely undeserved.

2. To feel superior to everyone even though you are not.

3. To feel that you are the greatest based on a past that you were likely not involved in.
That guy thinks he is so much better than any other baseball fan because he roots for New York. He has a case of Yankee Fan Syndrome.
by Theguy945 June 24, 2010

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