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1.
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.
af TheJoo44 12. marts 2009
 
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.
af f0rTyLeGz 6. oktober 2009