Top Definition
1) A condition in which a person is so overcome with lust and affection for their first girlfriend that they tend to act in an irrational manner, and adopt the belief that relationships are all "gumdrops and rainbows in perfectland."

2) An advanced state of being lovesick for one's girlfriend.

The person is almost guaranteed to suffer temporary depression, threaten to attempt suicide, become pussy whipped, abandon pre-existing friends, cancel prior plans so he/she can "spend more time" with their girlfriend, spend massive amounts of unnecessary money on dinner/movies/flowers/her bills/candy/etc, or all of the above.
Guy 1: "Dude, where the hell has Frank been!? I haven't seen him in over a month!"

Guy 2: "He's got a bad case of firstgirlfriendisitis, man. He started dating Suzie, and he ended up spending the money he was saving for college on her!"
by BombaRed April 09, 2009

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