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1.
When a fact is imagined and applied as proof in an accusation.

A portmanteau of accusation and hallucination.
Person A: I heard that one in ten people have, at one time, eaten some of their own foreskin and you're the tenth person I've met today, so... QED
Person B: Actually, you didn't count yourself
Person A: Curses! My accucination has backfired!
by Ak You Sin Nation July 30, 2009