Embrujo translates to "spell" or "bewitchment," a word used to describe a magical charm or enchantment cast upon someone.
In this song, Juanes uses this powerful word to describe the intoxicating and irresistible hold his lover had over him. He sings that his deep sorrow is the fault of her embrujo, painting a vivid picture of a love that was both magical and destructive.
This song is one of the most dramatic breakup anthems ever. Juanes, an artist from Colombia, is not holding back. He's wearing a black shirt, but it's not a fashion choice. He tells us, "Tengo la camisa negra / Porque negra tengo el alma" (I have the black shirt / Because my soul is black). His love is in mourning, and he's blaming it all on his ex, whose love was like an "embrujo" (a spell or curse).
He feels completely destroyed by this relationship. He sings about drinking the "veneno malevo de tu amor" (the evil poison of your love) and being left "moribundo y lleno de dolor" (dying and full of pain). The song gets even darker with the hilariously blunt line, "tengo la camisa negra / Y debajo tengo el difunto" (I have the black shirt / And underneath I have the deceased). He's literally carrying his dead love around with him. It's a rock song full of over-the-top misery, regret, and blame, and that's exactly what makes it so much fun to sing along to.