Cuernos literally translates to "horns". However, in Spanish, the phrase "pegar cuernos" is a very common idiom that means "to cheat on someone".
In this dramatic bachata, Romeo Santos accuses his partner of infidelity, singing, "pegaste cuernos a su papá" (you cheated on their dad). Learning this expression is key to understanding the raw emotion and betrayal at the heart of many Latin songs.
Romeo Santos is having a very bad night in this song. He's in a bar, ordering endless glasses of rum—"Otra copa de Brugal" [Another glass of Brugal]—and he wants everyone to see him cry. This isn't just sadness; it's a full-blown, dramatic meltdown over being cheated on. He feels like a fool, singing, "Si me engañas una vez la culpa es tuya, la segunda soy pendejo" [If you cheat on me once, it's your fault; the second time, I'm an idiot].
He's torn between love and hate for his partner, and he's not holding back. One moment he says he loves her, and the next he says, "Creo en Dios, pero te quiero en el infierno" [I believe in God, but I want you in hell]. The drama gets even bigger when he brings their children into it, blaming her for making him want to "Dejar mi vida en un bar" [Leave my life in a bar] and telling her their son will end up an orphan. It's a classic bachata theme of heartbreak, but with Romeo's signature theatrical flair.