Besarnos de cero literally translates to "kiss each other from scratch" or "kiss each other from zero." It's a unique and evocative phrase that goes beyond a simple kiss.
In the context of the song, it signifies a desire to restart a relationship, to wipe the slate clean, and to begin anew with the innocence and passion of a first kiss. It's a powerful metaphor for reconciliation and a fresh start in love.
"Besarnos De Cero" is Danny Ocean's take on a relationship stuck in a loop of breaking up and almost getting back together.
She tells him it's over and that it won't work, and it hurts him every time she says it. Then the next day she calls back, apologizes, and says she understands him after all. In the chorus he wants to try again from zero: "besarnos de cero" literally means kissing each other from scratch, starting the romance over as if for the first time.
But the song doesn't end on that reconciliation. By the final verses she's cold again, and this time she doesn't even reply. It's a song about wanting a clean restart with someone who keeps leaving you on read.