Moribundo means 'dying' or 'on the point of death'. It's a very dramatic and literary word that you won't often hear in everyday conversation.
In this fiery song, Natti Natasha uses it to wish her ex a terrible fate, singing that he "termines moribundo de amor" (end up dying of love). It’s a powerful way to describe being completely consumed and destroyed by a broken heart, perfectly capturing the song's vengeful tone.
If you're looking for a song about getting over a breakup, this is it, but forget the sad, crying-in-your-room vibe. "Desde Hoy" is a full-on declaration of independence and revenge. Natti Natasha kicks things off by announcing she's completely rebuilding her life without her ex: Desde hoy reinvento mi universo / Y en mi mundo ya no te quiero adentro ("From today I reinvent my universe / And in my world, I don't want you inside anymore"). She makes it clear that forgiveness is off the table, comparing their dead relationship to a withered flower: Una margarita después que marchita / No vuelve a ser una flor ("A daisy, after it withers / never becomes a flower again").
She doesn't just leave it there. The rest of the song is a list of incredibly specific and brutal curses she wishes upon him. She hopes que el agua de tu fuente / Se contagie de veneno ("that the water of your fountain / gets infected with poison") and that his life breaks into little pieces. It's a powerful and angry anthem about taking back control and making sure the person who hurt you knows exactly how you feel. She's not just moving on; she's wishing him the absolute worst on her way out.