Desparejado literally translates to "unmatched" or "unpaired." While it can describe anything that lacks a match, it's particularly interesting here because it's used in a relatable, everyday context.
In the song, the artist sings, "Soy un calcetín desparejado" (I am an unmatched sock). This vivid and somewhat melancholic image of a lone sock perfectly captures the feeling of being lost, incomplete, and out of place after a breakup, making it a memorable and evocative word choice.
In "PA NO VOLVER," which translates to "SO YOU DON'T COME BACK," Recycled J delivers a powerful message to a former lover: if you're leaving, make it permanent. The song is a raw look at the aftermath of a painful breakup. The singer feels completely broken, comparing himself to a "mismatched sock" and an "old, broken piece of junk." He feels powerless, like a "disarmed robber," and is trying to cope with antidepressants and expensive liquor, even following a doctor's advice to delete their number.
The chorus repeats the main idea, emphasizing that the departure should be final, like "waves that go away when they break" or like months and years that pass and never return. He's so lost that even his ghosts have abandoned him. He reflects on what went wrong, wondering if their love had simply "expired" or if he was blind to the problems. In the end, he feels he's become a heartless "monster" because of the experience, making it clear that there's no going back.