Calentura literally means "heat" or "fever," but in a colloquial and often suggestive context, it refers to intense passion, lust, or sexual arousal.
In this song, the lyrics "La calentura era eterna" (The passion was eternal) clearly use calentura to describe the intense, burning passion and sexual chemistry between the singer and his former lover. It's a vivid and somewhat provocative word that captures the raw emotion and physical intimacy of their past relationship, making it very enticing.
La Adictiva, Justin Quiles, and Calle 24 bring us a song all about a love that just won't die, at least for one person! The singer is definitely not over his ex, even though he hears she's changed and is with someone famous now. He calls her, but her phone is always off. He's a little salty about her new guy, saying "Pura mierda, si ahora mismo todos son verificados" [Pure crap, everyone's verified right now].
He's convinced she's lying to her new boyfriend and even to herself about forgetting him. He keeps reminding her of all their wild times, like "Todas las peda 2022" [All the parties in 2022] and "La noche que rompimos el sillón" [The night we broke the couch]. He's so sure she misses him, he'd bet a million dollars! He even brags, "Pa' mí yo te hacia el amor" [For me, I made love to you] and implies her new guy can't compare. It's a fun, slightly bitter, and very confident look back at a past relationship that one person just can't let go of.