Expiró is the past tense of the verb expirar, which means 'to expire' or 'to breathe one's last'. While it's a direct cognate of the English word, its use in this song is what makes it special.
Jhayco sings, "lo de nosotros se expiró" (our thing expired). Instead of a more common phrase like "se acabó" (it ended), this word choice creatively frames the relationship as something with a shelf life that has naturally come to its end. This poetic metaphor is a memorable and modern way to describe a breakup.
Jhayco and Peso Pluma team up for a track that's all about that one ex you just can't quit. The whole song is basically Jhayco trying to convince his "ex especial" [special ex] to sneak away with him for a night. He's not subtle about it, offering up "Botellas de cristal" [Crystal bottles] and a "cuartito en la suite del Intercontinental" [a little room in the Intercontinental suite]. He knows she's with someone else now, but that doesn't seem to matter.
He's nostalgic for their physical connection, wanting to do it "como la primera vez" [like the first time] and missing her "olor a cocoa" [cocoa smell]. He's also clearly still obsessed, admitting he can't stop drinking and that "La vida sin ti no me para de joder" [Life without you doesn't stop messing with me]. It's a messy situation where she's still messaging him on Instagram behind her new guy's back. He wants to keep their connection a secret—"Close Friends, no me publiques" [Close Friends, don't post me]—but he's also hurt, ending the song by complaining he ended up "solito como Dr. Dre" [alone like Dr. Dre].