Aurora boreal is the beautiful Spanish phrase for the "northern lights." It's a rare and poetic term that you won't find in most songs.
In this track, the singer opens with the heartbreaking line, "Tú eras mi aurora boreal" (You were my northern lights). He uses this metaphor to describe a love that was once spectacular and magical, but has now faded, setting the stage for a powerful song about loss.
This song is one big, dramatic breakup rant, and it's amazing. The singer starts by saying his ex was his aurora boreal [northern lights], something beautiful and unique. But that's the last nice thing he has to say. Now, he's drinking wine, trying to forget her, and wondering, “Qué chingados nos volvió a pasar” [What the fuck happened to us again]. It sounds like this isn't the first time they've had a huge fight.
He blames her for everything, listing all the ways she messed up. They had plans for kids, but now “ya no va a pasar” [it's not going to happen anymore]. He accuses her of breaking glasses and even letting the dog escape! The ultimate burn comes when he says, “Bien dijo mi amá, no eras especial” [My mom was right, you weren't special]. The chorus is just a list of all his problems, and he blames every single one on her: the hangovers, losing his friends, and being unhappy. He ends with the incredibly blunt line, “Tú chinga tu madre por mí” [Go fuck your mother for me], which is his way of saying she can go to hell.