Maleante translates to "hoodlum" or "delinquent." It's an interesting word because it's not commonly found in everyday romantic songs, making it stand out.
In the context of the song, the singer uses it to describe how the parents of his love interest perceive him: "Cual si yo fuera un maleante" (As if I were a hoodlum). This highlights the conflict and drama in the lyrics, where the singer feels unfairly judged and misunderstood by his girlfriend's parents.
Somebody's parents have decided Dalvin is a bad idea. Ya te lo tienen prohibido (they've already forbidden you), and the rest of the song is a list of what they say about him: that he is un maleante (a thug), that she is a good girl who shouldn't love him, that he will only make her suffer. He repeats their accusations back at them one by one instead of arguing, which lands harder.
His answer is short and stubborn. Pueden levantar un muro / En el frente de tu casa / Y yo lo derribaré (they can put up a wall in front of your house, and I will knock it down). The title is an order aimed at the parents: let her go. Then, halfway through, he drops the story entirely to shout out the players and the DJs, Esto es para los musicólogos (this one is for the musicólogos, which in the Dominican Republic means the selectors who spin bachata), and the guitar takes the rest. That swerve is very Dominican, and it is the best part of the record.