(as|) nutty as a fruitcake
1
(of a person) crazy or exhibiting odd behavior
The phrase "nutty as a fruitcake" has emerged in the United States in the 20th century. This idiom is used to describe someone who acts strangely, eccentrically, or in a bizarre manner.
- After staying up for days working on his novel, John started seeing imaginary characters.He's been as nutty as a fruitcake lately.
- Did you hear about Tom's latest idea to build a rocket-powered bicycle?He's as nutty as a fruitcake!
- My aunt always wears mismatched clothes and speaks to her plants.She's nutty as a fruitcake, but we love her.