Te mudaste comes from the verb mudarse, which literally means 'to move house'. While it's a common verb, Bad Bunny uses it here in a very clever and poetic way.
In the song's hook, he sings, "a mi mente te mudaste", which means 'you moved into my mind'. He's creating a powerful metaphor: this person isn't just a fleeting thought, they've permanently 'moved in' and are now living in his head. It's a perfect example of creative wordplay in music!
In this classic reggaeton track, Bad Bunny is completely obsessed with someone from his past. But this isn't a sweet love song about missing a partner; it's about missing a purely physical connection so much that it's taken over his thoughts. He gets straight to the point, saying he's looking at old photos and remembering their wild encounters, like the time they couldn't even make it to the hotel room: "Nos comimos en el carro, al cuarto ni llegamos" (We devoured each other in the car, we didn't even make it to the room). The song's whole idea is in the title line: "Desde que te desnudaste a mi mente te mudaste" (Since you got naked, you moved into my mind).
He can't find her anywhere and wonders if she went back to her ex, but he makes it clear he doesn't care. He's happy to be her secret lover, hilariously pointing out, "Tú no eres monja ni yo monaguillo" (You're not a nun and I'm not an altar boy). The song is full of his signature blunt and funny lines as he begs her to come back, remembering specific moments and hoping to repeat them.