El Tóxico turns heartbreak into a fiery ranchera drama.
In this anthem of wounded pride, Grupo Firme and Carin León flip the usual breakup script. Instead of begging for a second chance, the singer vows to become the ex from your worst nightmares. He once gave everything—his love, his life, even “a thousand reasons” to stay—but after being left without explanation, he promises payback. From poisoning the dog to haunting every memory, he plans to be an inescapable reminder of regret. Beneath the playful exaggeration and colorful insults lies a familiar feeling: when love turns sour, anger can feel like the only way to keep the hurt from winning. The song mixes humor, swagger, and raw emotion, showing that in Regional Mexican music, even revenge can come with an infectious beat.