Presumir means "to show off" or "to brag," but often with a sense of pride rather than just arrogance. It’s the perfect word to describe wanting to proudly display something or someone you value to the world.
In "Mi Refe," the singer is tired of hiding his relationship. When he sings, "Voy a presumir que estás dura" (I'm going to show off that you're hot), he's making a bold statement that he's proud of his partner and wants everyone to know they're together, capturing the song's shift from secrecy to public affection.
Have you ever been in a relationship that's a secret... but not really? That's exactly what Colombian artist Beéle is singing about in "Mi Refe". He's tired of pretending, because as he says, "To' el mundo ya supone que tú y yo somos algo" (Everyone already assumes that you and I are a thing). The whole town is gossiping and confirming that they're seeing each other, so he asks a very blunt question: "¿Pa' qué putas escondernos?" (Why the f*** are we hiding?).
He wants to stop all the sneaking around. He's ready to make it official and doesn't care what anyone else thinks. His message is simple: "Yo te gusto, tú me gustas / Eso hace rato se sabe" (I like you, you like me / That's been known for a while), so let's just "Delante de la gente bésame" (Kiss me in front of people). He's proud of his partner and wants to show her off, calling her his cure and saying they were born to be together.