Condena means "sentence," "conviction," or "condemnation," often used in a legal or religious context. It's a very powerful and dramatic word that you don't hear in songs every day.
In "Morena Canela," the singer uses it to describe the woman he desires: "Seduce, atrapa, tú eres la condena" (She seduces, she traps, you are the condemnation). He's poetically expressing that his attraction to her is an inescapable fate—one that is both thrilling and dangerous, like a curse (maldición) or karma.
In "Morena Canela," Mexican artist Chino Pacas does not waste time pretending to be subtle. He spots a girl posting online to get his attention ("Subiste una foto pa' que te vea" [You uploaded a photo so I'd see you]), and he replies with pure swagger and a fat wallet. He uses blunt Mexican street slang right out of the gate: "al chile" (honestly / to be real) followed by "tú sí estás bien buena" (you really are super hot). His pitch to take her out is ridiculous and funny. He promises to dress her in whatever luxury designer labels she wants ("Te forro de la marca que tú quieras" [I'll cover you in whatever brand you want]), while describing his own scent as a wild cocktail: "Huelo a problemas, Creed y mota cara" (I smell like trouble, Creed cologne, and expensive weed).
Things get even more intense when he calls this cinnamon-skinned girl his curse and his karma ("tú eres la condena, karma, maldición" [you are the sentence, karma, curse]). He openly warns rivals not to reply to her social media stories with "me la pela" (a vulgar brush-off meaning "they don't matter to me at all"). From playfully threatening to kidnap her for the night ("Hoy no llegarás a casa, voy a robarte, y sí, es una amenaza" [You won't make it home today, I'm going to steal you, and yes, it's a threat]) to planning their rendezvous "bichi" (north-Mexican slang for totally naked) in a motel, Chino leans hard into bad-boy romance.