nutty as a fruitcake
The phrase "nutty as a fruitcake" is an idiomatic expression used to describe someone or something as eccentric, peculiar, or mentally unstable. It implies that the person's behavior or characteristics are unusual or irrational, drawing a comparison to the sweet dessert, fruitcake, which traditionally contains a variety of nuts.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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