Empañan comes from the verb empañar, which means 'to fog up' or 'to mist up'. It's a vivid and somewhat unexpected word in a reggaeton song, making it memorable.
In the lyrics, Yandel sings, "Si te pillo dentro de un carro, Los cristales se empañan" (If I catch you inside a car, The windows fog up). This line cleverly implies intense passion and heat between two people, suggesting a steamy encounter that causes the car windows to fog up. It's a playful and suggestive way to describe intimacy without being explicit.
Yandel and Blessd build the whole track around one joke: comparing an ex who keeps circling back to weed he supposedly quit. The hook asks "¿Pero tú a quién engañas?" [But who are you fooling?] and lands the punchline right after: "Como yo con la ganja" [Like me with the weed], "Si te pillo dentro de un carro / Los cristales se empañan" [If I catch you inside a car, the windows fog up]. She swore him off, he swore off smoking, and neither one actually stuck to it.
From there the song stays physical instead of sentimental. Yandel plays the guy who was never as finished as he claimed ("Pa' tu cucho yo era un bandido" [To your family I was a bandit]), and Blessd takes the second half somewhere hazier, all hoodies and fogged-up glass again ("Mi hoodie cabe en tu cuerpo" [My hoodie fits your body], "En mi apartamento THC mezclada con tu aliento" [In my apartment, THC mixed with your breath]). Nobody here is calling it love. It's chemistry they keep giving into, and the song never pretends otherwise.