Can anyone please tell me what 'a que coucou' means? I have found it in a text about Johnny Hallyday where it says: Johnny a l'idée 'a que coucou'. When I google just 'a que coucou' on its own I get a lot of things about Johnny Hallyday so I was wondering if it comes from one of his songs? I would be grateful for any help as I'm completely stuck. Thanks.