Manuscrito literally translates to "manuscript", like an old book or document written by hand. It's a very unique and poetic word to find in a pop song.
In 'Despacito', the line "hacer de tu cuerpo todo un manuscrito" (to make your body a whole manuscript) is a beautiful metaphor. It suggests exploring and leaving a mark on a lover's body as if writing a unique story, turning an intimate moment into a work of art.
Luis Fonsi pairs up with the Mexican brass group La Bandononona Clave Nueva for a lively regional spin on a massive hit, and the premise is as direct as it gets. He locks eyes across the floor, announces "Tengo que bailar contigo hoy" ("I have to dance with you today"), and builds from there. The whole track runs on one irresistible rule: take everything slow. Even when his pulse speeds up ("se acelera el pulso"), he reminds his partner that "Esto hay que tomarlo sin ningún apuro" ("This has to be taken without any rush"). He compares their mutual pull to physics ("Tú eres el imán y yo soy el metal" ["You are the magnet and I am the metal"]), but the real hook is how patient he promises to be once they get close.
From whispering in someone's ear so they remember him later to writing all over their body like paper ("hacer de tu cuerpo todo un manuscrito"), the imagery turns shamelessly romantic and playful. He even jokes about crossing danger zones until you forget your own last name ("y que olvides tu apellido"). Towards the end, Fonsi shouts out his home island with an invitation to head down to the sand: "Vamos a hacerlo en una playa en Puerto Rico / Hasta que las olas griten 'Ay, bendito'" ("Let's do it on a beach in Puerto Rico / Until the waves shout 'Ay, bendito'"). That phrase "Ay, bendito" is everyday Puerto Rican slang; people use it constantly to mean "Oh, bless you" or express sympathy, shock, and sweet relief. Hearing the waves themselves shout it out gives the whole track a warm, sunny climax.