Top Definition
The wild uproar from fans of particular subject matter or a public figure when anything is done with the subject matter or public figure regardless of the quality of what is being done to, with or by the subject matter or public figure.
When Hollywood doesn't keep to the source material for movies based on comic books, fandumbmoanium breaks loose!

Everytime anything to do with Twilight happens, every household with a female in it turns into complete fandumnmoanium.
by theadamkomar March 23, 2011

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