unicorn defense
 n.— «The mixup occurred when a deputy prosecutor misunderstood an e-mail from a colleague who used the phrase “unicorn defense,” thinking it was an actual statement from Holliday, Paxinos said. “Unicorn defense” is a slang term used by prosecutors when a defendant blames some mythical person for a crime, he said.» —“Prosecutor: Unicorn defense was a mixup” in Billings, Montana Herald News Daily Mar. 14, 2007. (source: Double-Tongued Dictionary)

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