Formales translates to "formal" or "serious." While it might seem like a common word, its usage here is quite specific and intriguing.
In the context of the song, the singer is asking his partner to be "formales" (serious/committed) in their relationship, especially regarding fidelity. He says, "Lo que te encargo Es que seamos los dos formales," implying a desire for a committed and exclusive relationship, which adds a layer of depth to the word beyond its everyday meaning.
This song is a super direct and a little bit cheeky declaration of love and loyalty! Regulo Caro is basically telling his beloved, "Delante de mí, detente lo más que puedas" [In front of me, stop as much as you can]. He wants them to be totally committed to each other, asking that she doesn't love another man and he won't love another woman. He promises, "Tú para mí serás la mujer amada, yo para ti seré lo que tú más quieras" [You for me will be the beloved woman, I for you will be whatever you want most].
But here's the twist that makes this song so memorable: he adds, "Delante de mi chiquitita, a mis espaldas haz lo que quieras" [In front of me, my darling, behind my back do whatever you want]. It's a bold, almost humorous line that suggests a very specific kind of trust, or perhaps a playful acknowledgment of human nature. He wants formality and loyalty when he's around, but gives a surprising amount of freedom when he's not. It's a fascinating look at a relationship where honesty and boundaries are clearly, if unusually, defined!