Extrañas comes from the verb extrañar, which means 'to miss' someone or something. It's a common emotion, but the way it's used here is particularly poignant.
In the song, Feid asks his lover to "promete que me extrañas" (promise that you miss me). This plea highlights a deep emotional connection and a desire for reassurance, making it a powerful and relatable word in the context of a passionate relationship.
Feid spends this one making the same request in two languages. His half is Medellín Spanish and it is mostly reassurance sent from a distance: "Si estoy en la calle, en tanguita tú me esperas" (If I'm out on the street, you wait for me in a thong), "Sabes que te cuido la espalda" (You know I've got your back). Then the reassurance arrives with a weapon attached. "Si llevo balas en la espalda / Es para que tú solo sepas que yo te protejo a ti" (If I carry bullets in my back, it's just so you know that I protect you) is a strange way to tell someone you love them, and he offers it as the proof.
Sfera Ebbasta takes the second half in Italian and makes the same plea colder. Feid asks her to think of him; Sfera tells her exactly when she will. "Saranno solo amori estivi dopo di me" (They'll only be summer flings after me), and "Pensami ogni volta che la borsa / Che il tuo tipo ti regala non sarà di Chanel" (Think of me every time the bag your guy gives you isn't a Chanel). Both of them are out chasing money and asking to be missed for it, and by the end the hook has worn down to one word repeated, "Pensami-mi-mi-mi-mi", which is the only thing either of them is around to ask for.