Cloud cuckoo brings up 30 results, including this one from John..
a conviction for murdering five people including two children. If anyone believes for a minute that they will then they are living in cloud cuckoo land with La La.
So I don't really understand why Rob is, making such a fuss about me using it
This is what Wikipedia says about Cloud Cuckoo Land:
"Cloud cuckoo land is a state of absurdly, over-optimistic fantasy or an unrealistically idealistic state where everything is perfect. Someone who is said to "live in cloud cuckoo land" is a person who thinks that things that are completely impossible might happen, rather than understanding how things really are.[1] It also hints that the person referred to is naive, unaware of realities or deranged in holding such an optimistic belief.
In the modern world, a "cloud cuckoo land" is defined as someone who is seen as "crazy" or "strange" by most average people, often doing or saying things that seemingly only make sense to themselves, but also exhibit cleverness at times in ways no one else would think of.[2]"
Which is what I though in general. I'm sure it is not acceptable to say that someone is in "cloud cuckoo land" but it might be OK to warn someone of the dangers of going there.
So it is not the use of the words but how they are used.