Atraviesa comes from the verb atravesar, meaning to pierce, cross through, or go through. It's a strong, evocative verb that suggests a deep impact.
In the song, Nanpa Básico sings, "Me atraviesa el alma" (It pierces my soul). He uses this word to describe how the woman's actions or thoughts deeply affect him, reaching the very core of his being. It's a powerful way to express profound emotional impact.
Nanpa Básico opens on a physical complaint and never really moves past it: "Siento que tus manos ya no son de fuego" (I feel that your hands are no longer made of fire). What follows is a man watching the heat go out of something and refusing to pretend otherwise — "Lo estoy intentando, no me estoy haciendo el ciego" (I'm trying, I'm not playing blind) — while still keeping score. "Pero en mi cancha no me ganas el juego" (But on my court you don't win the game) is the one place he claims the upper hand, and he sings that whole quatrain four times across the song, as if saying it again might settle it.
The chorus refuses to pick a side. "Sé que eres buena y eres mala" (I know you're good and you're bad), "Más peligrosa que una bala" (More dangerous than a bullet) — praise and accusation in consecutive breaths. By the last section the two adjectives have stopped being a verdict and turned into a chant, buena and mala trading places at the head of every line ("Mala en todo menos en la cama" — Bad at everything except in bed), and the closing four lines come back in brackets as a backing echo rather than a conclusion. If you take one pair of words away from this song, it is that one.