Rancor means 'grudge' or 'deep-seated resentment'. It's a powerful word that goes beyond simple anger or sadness, describing a bitter, long-lasting feeling you hold against someone for a past offense.
In the song, Maluma declares he's over the breakup by singing, "Se eu não guardo nem dinheiro, que dirá guardar rancor" (If I don't even save money, what can be said of holding a grudge?). This clever line shows he has completely moved on; he's so carefree that he can't be bothered to hold onto negative feelings, making it a key word to understanding his cool, post-breakup attitude.
This is a breakup song, but it's not a sad one. Maluma is dealing with a broken heart in a very specific way. He tells his ex, "Tú me partiste el corazón / Pero mi amor no hay problema" (You broke my heart / But my love, there's no problem). Instead of being upset, he's decided to take a new approach to dating. Now he can "regalar / Un pedacito a cada nena" (give / a little piece to each girl). He's done with this one relationship because, as he says, she was cheating: "Te gusta estar rodando por camas ajena" (You like rolling around in other people's beds).
Now, he's changing the rules. He's going to "cambiar el sistema / Andar con gatas nuevas" (change the system / walk with new girls). The song mixes Spanish with Portuguese, thanks to the Brazilian artist Nego do Borel, who adds his own perspective. He has a great line where he says he's not going to hold a grudge: "Se eu não guardo nem dinheiro / Que dirá guardar rancor" (If I don't even save money / what can be said about holding a grudge). It's a fun, confident goodbye to a bad relationship.