Pulento is a Chilean slang term that means "excellent," "cool," or "awesome." It's a vibrant and informal word that adds a unique flavor to the lyrics.
In the song, the line "En que la pasamos pulento" translates to "In which we had an excellent time." It perfectly captures the carefree and enjoyable atmosphere the artist is describing, making it a memorable and regionally interesting word to learn.
"Privado" is about wanting a fling to stay just between two people. The singer asks a woman to see him in private rather than out in public, since she likes to keep things quiet and it isn't something for everyone to know about.
The rest of the song describes a secret night together: sneaking off, being careful not to let anyone find out, and remembering how good that time felt. It's a playful, flirty track about chemistry that works best kept hidden.