Peste literally translates to "stench" or "plague". It's a very strong word used to describe an overwhelming, foul smell or a devastating disease.
In this song, Romeo Santos uses it in a deeply poetic way, singing "Nuestro apartamento tiene una peste a agonía" (Our apartment has a stench of agony). He's not describing a literal smell, but rather the suffocating atmosphere of despair and heartbreak that now fills his home. This dramatic metaphor makes it an incredibly powerful and memorable word.
Ever felt so hopelessly dumped that your only remaining friend is your smartphone assistant? That is the exact mess Romeo Santos and Chris Lebron find themselves in on "SIRI". Romeo turns his iPhone into a desperate mediator, literally begging his voice assistant: "Siri, llámala y dile que, que vuelva" ["Siri, call her and tell her to come back"]. The heartbreak has completely wrecked his apartment. He says "sin ella la casa se ha vuelto una selva" ["without her, the house has turned into a jungle"] and dramatic lines like "nuestro apartamento tiene una peste a agonía" ["our apartment smells of agony"]. He is not sleeping either; the bed is just furniture at this point ("la cama la tengo de adorno" ["I only have the bed for decoration"]).
What makes this track fun is how it mixes classic bachata drama with very modern tech misery. The narrator is frantically searching the web ("llevo la computadora loca googleando sobre ti" ["I've got the computer crazy googling you"]) and embarrassing himself online ("suplicando por las redes, soy el más viral" ["begging on social media, I'm the most viral"]). He even uses the Spanish idiom "si la vida te pasa factura, ¿dónde es que se paga?" ["if life hands you the bill, where do you pay it?"], which comes from the phrase pasar factura (meaning your past actions or bad luck have caught up with you). Facing a total communication blackout before she hits the block button, he figures that if his ex hates hearing his voice, sending Siri as a messenger is his absolute best shot.