Top definition
The outrage, rant or of course, tantrum of a fan (or former fan in certain severe cases) of a company, product or media due to the percieved "failures" in endorsement or change in theme or substance.
I had a BAD Fantrum over my favorite show's cancellation.

Did you notice that Mountain Dew is now "MTN" DEW?! FANTRUM!
by Redeadhunter July 23, 2010
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