What does Fa fa mean?

Answer 1

It is the 1 st person conjugation of the verb Fare.

It is not easy to translate for fa means to make/to do in Italian.

As in:

I am doing something - Sto facendo qualcosa

What are you doing? - Che cosa state facendo?

In the context of the song "fa fa l'americano"

The 1on1 translation is "it makes the American go"

Free translated it means: "I am doing something and that makes the American go!