Top Definition
The craziness and confusion caused by thousands of people trying to force their way into an Anime/Comic/Star Trek Convention dressed as their favorite characters.
When we tried to get into Megacon, it was sheer Fandemonium.
door TheJoo44 12 maart 2009
1 more definition
wild uproar or unrestrained disorder by supporters of a popular act, icon, or sports team.
At the Blazers scrimmage there was fandemonium when the team was introduced.
door f0rTyLeGz 6 oktober 2009

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