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Synonym for "fantwit" and "fanbrat", a slightly derogatory term used in place of other, lengthier phrases, such as "hyperactive rabid fangirl(boy)".

Fannits generally have the writing skills of a twelve year-old AIMer.
I was talking to this kid online, and man, she was a total fannit.
by Seshennu December 02, 2005
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