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.
by TheJoo44 March 12, 2009
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2
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.
by f0rTyLeGz October 06, 2009
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