Erizar is a unique verb that means "to make stand on end" or "to bristle," like the quills of a hedgehog (erizo). It's most famously used in the phrase erizar la piel, which literally means "to make the skin bristle"—our equivalent of "to give someone goosebumps."
In this passionate ballad, Enrique Iglesias sings about wanting "a erizar de frío tu piel" (to give your skin goosebumps from the cold). He uses this vivid, physical imagery to express his deep desire to have a powerful emotional and physical effect on the person he loves.
Spanish pop star Enrique Iglesias goes completely over the top in "Héroe", and that dramatic intensity is why it works so well. He is not offering casual affection here; he wants to be everything. In the chorus, he sings, "Si pudiera ser tu héroe / Si pudiera ser tu Dios" ("If I could be your hero / If I could be your God"), linking her rescue directly to his own peace of mind: "salvarte a ti mil veces / Puede ser mi salvación" ("saving you a thousand times / Can be my salvation"). The physical imagery is dialed up to eleven right from the start, dreaming of giving her chills ("erizar de frío tu piel" [make your skin bristle with cold]) and kissing her so intensely that he could die right on the spot ("Y morirme allí después" [And die there afterward]).
Beyond the grand promises, the lyrics give us great everyday Spanish expressions. When he sings "A quemar, que sé yo, tu boca" ("To burn, I don't know, your mouth"), the phrase "que sé yo" works exactly like "or whatever" or "I don't know" in conversational English, tossing an offhand shrug into an otherwise heavy line. He also shrugs off his internal pain by saying "Y qué más da" ("And what does it matter?"), deciding that "Lo que importa es que te quiero" ("What matters is that I love you"). It is a song full of total, reckless devotion where saving someone else is the only thing that saves him.