Marchado comes from the verb marchar, which means "to march" or "to leave/depart." While "to leave" is common, marchar often implies a more definitive or even dramatic departure, like marching away.
In this song, the lyrics repeatedly state, "si no se ha marchado es porque usted no quiere" (if you haven't left, it's because you don't want to). This emphasizes the choice and agency of the person in the relationship, making marchado a key word for understanding the song's theme of letting go.
This song is all about someone who's had enough of a partner's indecision and drama!
The singer is basically saying, "Look, you can't live without me, but then you're full of doubts? What game are we playing?" They're tired of the back and forth and just want the person to make up their mind. The lyrics are super direct: "Y si se quiere ir, pues que le vaya bien" [And if they want to leave, then good for them]. It's a declaration of independence, saying, "Nobody yells at me! The door is wide open, the light is green!" If the person hasn't left, it's because they don't truly want to. The singer is ready to move on, even joking that the person will be crying and missing them, but by then, they'll already be forgotten. It's a sassy, confident anthem for anyone who's ready to tell a wavering partner to either commit or hit the road!