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)
Further reading
What’s it like to hike the Pacific Crest Trail all the way from Mexico to Canada? You’ll end up with sore muscles and blisters, and great stories to tell. Along the way, you’ll also pick up some slang, like NoBo, SoBo, Yo-yo and...
Jim in Columbia, South Carolina, has noticed sportscasters’ use of the phrase on the season with reference to a period of time. This construction shows up in the sports pages as early as the 1880s, first referring to a team’s revenue and...