Pedacitos is the diminutive form of pedazos, meaning "pieces." The use of the diminutive adds a tender and intimate nuance, suggesting small, cherished fragments rather than just ordinary pieces.
In the song, Antonio Orozco sings, "Estoy hecho de pedacitos de ti" (I am made of little pieces of you). This beautiful phrase conveys that his very being, his essence, is composed of the small, precious parts of his beloved, highlighting a deep and profound connection.
This duet with Alejandro Fernández is about being left behind by love and still carrying it. The singer says the light in his eyes was hers, "esa luz que alumbra la distancia entre tú y yo" (that light that lights the distance between you and I), and even now, after a night that "fue gris" (was gray), he is still "hecho de pedacitos de ti" (made of little pieces of you) — her voice, her walk, her laugh. It plays as a quiet inventory of what stays after someone leaves: not the whole person, just the fragments a memory holds onto.