loon

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Related to Loons: Common Loon

crazy as a loon

Insane. Often used jocularly. Don't leave me alone with Uncle Stu, he's crazy as a loon!
See also: crazy, loon

*crazy as a betsy bug

 and *crazy as a peach-orchard boar; *crazy as a loon
Rur. acting as if insane. (*Also: as ~.) Tom: Susan says she's really the Queen of England. Bill: She's crazy as a betsy bug. Jill: David's a little eccentric, isn't he? Jane: Crazy as a loon, I'd say. What's wrong with Jim? He's acting as crazy as a peach-orchard boar.
See also: betsy, bug, crazy