Pretao is a colloquial and shortened form of "apretado," which means "tight" or "squeezed." It's a word rooted in Caribbean Spanish, particularly from the Dominican Republic, where Vicente Garcia is from.
In the context of "Amor Pretao," it describes a love that is intense, perhaps overwhelming, or even suffocatingly close. It evokes a feeling of being tightly bound by love, making it a unique and culturally rich word choice for the song.
"Amor Pretao" ("Borrowed Love") is Dominican singer-songwriter Vicente García's confession about loving on borrowed time. He admits he rarely lets his chest hold "the whole world" ("He sentido el mundo entero" — "Have I felt the whole world"), watching gulls pass overhead singing "a pleno vuelo" ("in full flight") while he keeps settling for less than he hoped. The hook says the quiet part out loud: "Amor pretao, ay ombe" ("Broken love, oh man"), repeated like someone talking himself through a loss he can't quite name.
By the bridge the image turns nautical: he calls it "Amor de un náufrago... que se ha quedado sosobrando por la mar" ("Love of a castaway... who has been left adrift at sea") — a love that never reached shore, still floating somewhere no one can pull it in.