Batshit insane
From Fan History Wiki
Term commonly used on Fandom Wank, but not restricted to any particular place or group of people. Defined along the lines of "Crazy. Coo-coo. Off your damn rocker."
As a general rule, someone who is batshit insane is a person who takes fandom too far. According to popular opinion, a lot of fandomers are, you might be, the person who wrote this article probably is, and most of the InuYasha, Full Metal Alchemist, and Harry Potter fen definitely are.
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