Cloud Cuckoo Land refers to an unrealistically idealistic state where everything is perfect. (`You`re living in cloud cuckoo land, mate.`) It hints that the person referred to is naïve, unaware of reality or deranged in holding such an optimistic belief. The reference comes from The Birds, a play by Aristophanes in which Tereus helps Pisthetai......
[n] - a place where you say people are when they seem optimistically out of touch with reality
noun an imaginary place where you say people are when they seem optimistically out of touch with reality