Joseo is a popular slang term from Puerto Rico that means "the hustle" or "the grind". It refers to the hard work you put in every day to make a living and get ahead.
In "Aquel Nap ZzZz", Rauw Alejandro sings, "El joseo todos los días hasta la madrugada" (The hustle every day until dawn). He's expressing his dedication, saying he works tirelessly to provide for his partner and build a future together, blending romance with ambition. It's a perfect word to understand the heart of modern reggaeton lyrics.
This song is a super sweet and intimate look into a perfect moment. Rauw Alejandro paints a scene of his partner sleeping on him by the sea, saying, "Tú dormida encima de mí / La brisa viene del mar" (You asleep on top of me / The breeze comes from the sea). He sees her as precious, calling her his "niña de cristal" (crystal girl), and wants to freeze time because the moment is so good. He's completely devoted, promising he'd do anything for her even though he knows she's strong on her own.
The whole song feels like a love letter. He talks about how she healed him, taking away his sadness with a kiss. He works hard so he can give her everything, like a trip to Tokyo. He even gets specific about their future, saying he can't wait for his tour to be over so he can come home and make "un par de mini tú" (a couple of mini yous) with her. It's a song about a deep, mutual love where they take care of each other, and he wouldn't change a thing, even if it were a mistake.