It's a cute and playful nickname that is often used for young girls, but can also be used for adults in a playful or familiar way.
Here are some examples of how "Fifi" might be used in French:
* "Bonjour, Fifi!" (Hello, Fifi!)
* "C'est ma petite Fifi." (This is my little Fifi.)
* "Fifi, viens ici!" (Fifi, come here!)
It's important to note that while "Fifi" can be a friendly nickname, it can also be considered slightly childish or unprofessional in some contexts.