Interesting Word - Coucou

An interesting word came up the other day. The message to me started off "Coucou Roy!" I had never heard that expression before so i looked it up. It seems it's a way of starting E-mails to friends as a way of saying "Hi there!" or "Hi, I'm back" to a friend. It's also a way of calling attention to someone (example: someone who may be across the street & you are trying to get their attention. You woud shout "Coucou Pierre!"). Coucou can also mean "Peek-a Boo"

Now in English if you called someone a Cuckoo, it would mean you are saying they are crazy :)

Coucou (koo koo)

Anyone who knows more about this word let us know. 

à plus tard-Roy