Top definition
A person that supports a sportclub, artist or brand after a rare event.
They will only be fan for a short while, when the event is out of the media you`ll never see the person be fan unless there is another unusual event.
Event: Steve Jobs died

Reaction of the pop-up fan:
Wearing a black turtleneck shirt for the coming week & definitely all of the sudden wants all the apple products that are so "special" just because that was the last product of Steve Jobs.

Mainly tweeting a lot and not really putting their words to practice because they don't have enough money to buy their way in to every excitement they have.
by RyanBoss October 30, 2011
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