What does todo been mean?
I don't know how to use "todo" like this but does it means "do you like it?"?
It used in restaurant. I thought he just ask after her (todo bien?) at dinner but he said same word again.

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You are right. "¿Todo bien?" may mean, in the context you are talking about, "do you like it?", "did you enjoy the meal?". Literally, it means "Is everything OK?".

A possible answer is "Todo bien", meaning "everything is OK" or "everything is fine".

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todo =all/everything           
bien = well/fine/good/alright

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todo = all
bien = good
todo bien = all right

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It can mean all, everything or even everyone.

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todo = all

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