Aferrado comes from the verb aferrar, meaning to grasp, cling, or hold on tightly. In this context, it describes someone who is stubbornly persistent or unwilling to let go of a person or a situation.
In the song, the singer is aferrado to his love interest, despite her indifference and her parents' disapproval. He's so determined that he's willing to drink until dawn and serenade her, highlighting his unyielding pursuit of her affection.
Ever been so stubborn in love that you just won't give up? That's the heart of Virlan Garcia's song, "Aferrado," which literally means "stubborn" or "clinging."
The singer tells a story of unrequited love and desperation. He's hurt because the person he loves won't even say hello to him on the street, and their parents clearly disapprove—her mom doesn't like him and her dad is furious. He sees this person as his "misfortune" and it's driving him to act out.
He makes a heartfelt plea, promising to change his ways and give up partying ("dejo la peda") if they'll just give him their love. But until that happens, he's coping by drinking beer until sunrise. He fully admits he's being stubborn, but he doesn't care. He's even willing to get drunk and sing a serenade, all in the hope of winning their love back.