However, it seems like a combination of two phrases, possibly with a slight misspelling:
* "Feliz día, San" - This translates to "Happy day, San" (likely referring to a person named San).
* "Eres lo mejor" - This means "You are the best."
Putting these together, the phrase could be interpreted as:
"Happy day, San. You are the best."
It's important to remember that the context and tone of the phrase can be significantly impacted by how it's used and the relationship between the speaker and the listener.