Musa elevá' is a poetic phrase that literally means "elevated muse". A musa (muse) is a source of artistic inspiration, and elevá' is a common Caribbean slang contraction of the word elevada (elevated or high).
In the song's chorus, Omar Courtz uses this phrase to tell a woman that she is his ultimate inspiration. Her presence gets his creative energy flowing to such a degree that he feels artistically 'high' and completely in the zone. It's a powerful way to say "you inspire me."
In "M U S A E L E V Á", Puerto Rican artist Omar Courtz is completely hooked on a secret flame he met while touring the United States. The title sets the mood right away: having your musa (muse) on high means your creative inspiration is totally sparked by someone. In this case, she is the only thing on his mind. He describes the sweet, chaotic rhythm of their late-night linkups: "Se emociona cuando llego y se encojona cuando el nene se va" ("She gets excited when I arrive and pisses off when this boy leaves"). The word encojona is classic Puerto Rican slang for getting genuinely mad. Whenever she hits 'enter' on a text, he drops everything to pick her up, contrasting her warm skin against a freezing bedroom with "Ella está calientita, el cuarto frío, Detroit" ("She's warm, the room is cold like Detroit").
Omar keeps the story funny and direct with vivid modern details. He drops a line about her running an OnlyFans account while job hunting: "Un poco de Only en lo que busca un employ" ("A little bit of Only while she looks for employment"). He also handles her jealous ex ("Ella tiene un ex psycho, le bajé el moco" ["She has a psycho ex, I put him in his place"]), where bajar el moco is colorful island slang for knocking someone down a peg. By the end, a voicemail from the girl plays out, showing her debating whether to grab food with a friend or cancel everything because Omar leaves tomorrow. It is a late-night, addictive hookup track packed with blunt lines and genuine anticipation.