What does 'coucou' mean in french??
I've heard a lot of people say this when first starting a conversation. what does it mean?

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It's a way of attracting your attention..kind of like saying 'Hello!' or 'Yoo-hoo!'.

French speakers say it to babies to engage their attention, and also to children or adults whose concentration might be wandering.

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It just used to say hi in a cute way

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it's like" hello' or "hi" 
you can say also "salut