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(as) crazy as a coot
Insane or eccentric. Often used jocularly. Don't leave me alone with Uncle Stu—he's crazy as a coot! I know some of my students think I'm as crazy as a coot because of my weird methods.
crazy as a betsy bug
Insane. Don't leave me alone with Uncle Stu, he's crazy as a betsy bug!
crazy as a loon
Insane. Often used jocularly. Don't leave me alone with Uncle Stu, he's crazy as a loon!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*crazy as a betsy bugand *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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
crazy as a loonAMERICAN, INFORMAL
If you describe someone as crazy as a loon, you mean that their behaviour is very strange or silly. She was obviously crazy as a loon.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
crazy as a coot/loon
Lunatic behavior. The simile to the water bird dates from the sixteenth century, when John Skelton (Phyllyp Sparowe, 1529) wrote, “the mad coote, with a balde face to toote.” It is not known whether the craziness refers to the bird’s strange behavior in winter, when flocks of coots on a frozen pond sometimes fly wildly at one another, or to the senile behavior of the very old. (See also bald as a coot.) A related ornithological simile is crazy as a loon, probably derived from the weird loud cry of this bird. However, loony for “crazy” comes not from the bird but from lunatic, in turn related to the ancient belief that the phases of the moon (Latin luna) influence human behavior.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer