Fulano is a colloquial Spanish term used to refer to an unnamed or unspecified person, similar to "so-and-so" or "what's-his-name" in English.
In the song, the singer uses fulano to refer to the love interest's current boyfriend in a somewhat dismissive way, highlighting his desire for her to leave him and be with him instead. It's an interesting word choice that adds a touch of casualness and a hint of rivalry to the lyrics.
Have you ever seen someone across a room and felt an instant, powerful connection? That's the story of "La Cita (Version Pop)"! The song describes a chance meeting, a cita de azar, where a simple glance feels like a "cyclone." The singer is so captivated that he doesn't care if the person he's watching is with someone else; he feels like destiny is at work, bringing two strangers together who already know they're going to miss each other.
The magic of the moment grows when they finally talk and dance. She even dedicates a song to him, making him feel like they are two souls "shipwrecked in passion." However, there's a bittersweet reality hanging over them. He knows that soon she'll have to leave with the person she came with, and he'll be left alone, unable to forget their brief but unforgettable encounter.