Emigrante means "emigrant," someone who leaves their home country to live in a new one.
This song uses the word in a stunningly creative metaphor: "Quiero ser una emigrante de tu boca delirante" (I want to be an emigrant from your delirious mouth). The singer isn't talking about travel; she wants to 'live' in her lover's words and kisses, making their mouth her new home. It's a powerful and unique way to express an all-consuming desire for intimacy.
Amaia Montero's "Quiero Ser" is a beautiful list of wishes, all centered around one person. She's not just saying "I love you"; she's describing all the things she wants to be for and with this person. She wants to be something simple and pure, like "una palabra / Serena y clara" [a serene and clear word], but also something wild, like "un alma libre de madrugada" [a free soul at dawn]. It's a song full of hope and a deep desire for connection.
The song also touches on some past pain. She sings about wanting to be "una emigrante / De tu boca delirante / De deseos que una noche / Convertiste en mi dolor" [an emigrant / from your delirious mouth / of desires that one night / you turned into my pain]. But despite this hint of hurt, her main focus is on the future. She wants to feel safe and close, to "dormiré a la verita tuya" [sleep right next to you]. My favorite part is the contradiction in wanting to "cantar a la libertad" [sing to freedom] while also wanting to be "amarradita siempre a tu cintura" [always tied to your waist]. It perfectly describes that feeling of wanting to be your own person, but also completely wrapped up in someone you love.