Top Definition
Stands for "Freezing Index Finger Syndrome" Usually occurs around October when the weather becomes colder. Inflicted by constantly playing handheld videogames where your index finger is alone and cold.
Person 1: "Dude, what's wrong with your finger?"

Person 2: "I couldn't stop playing Birth By Sleep last night, and now I have FIF Syndrome!"
by Keria1010 October 03, 2010
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