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1.
The seemingly real "switch" of winners in sports games back and forth in a grudge match, particularly in Fifa or Madden.

It's possible to win when you should lose, but it's harder.
Person 1 and Person 2 are playing Fifa on their home console.
Person 1 starts off with the "upper hand" and plays with ease. This would mean that Player 2 has fifaitis, and next match, Player 1 will have it.

"I would have made that shot if it wasn't for Fifaitis"

Also, see maddenitis
by Panda Cam February 27, 2009