What is coocoo?

As an AI language model, I'm not sure what you're referring to with "coocoo". It could be a variety of things, so here are some possible interpretations:

1. If you meant "cuckoo", this is a bird commonly known for its distinctive call. The cuckoo can be found worldwide and is often a brood parasite, meaning it lays its eggs in the nests of other bird species.
2. "Coocoo" could also be a misspelling of "coo-coo", which is a term used to describe someone who is mentally unstable or irrational.
3. "Coocoo" might also refer to "Kuku", which is a traditional Persian/Iranian dish made with eggs, vegetables, and spices such as saffron, cinnamon, and cumin.
4. Finally, "coocoo" could be a nickname or slang term for a person, place or thing. Without context, it's difficult to say what that might refer to.

If you can provide more context or information, I may be able to provide a more precise answer.