“Oui, oui” in French translates to “Yes, yes” in English. It’s a simple, affirmative expression, but the repetition of “oui” can sometimes add emphasis or convey enthusiasm, similar to saying “Yes, yes!” or “Absolutely!” in English.
In a more playful or childish context, “oui, oui” could also be used to mimic a childlike way of speaking. Additionally, it could be associated with a humorous or exaggerated tone depending on the situation.