"Having a really good time"
Here's why:
* Bien amuss means "having fun" or "enjoying oneself" in French.
* Trop bien literally translates to "too good" or "very good," intensifying the feeling of enjoyment.
Putting it together, the phrase emphasizes the speaker's strong sense of enjoyment and fun.
Other possible translations that capture the essence include:
* "Having a blast"
* "Having the time of my life"
* "Really enjoying myself"
The best choice depends on the context and the level of formality you want to convey.