Celibato translates to "celibacy", which is the state of abstaining from marriage and sexual relations. It's a surprisingly formal and rare word to find in a reggaeton song, which makes it stand out.
Anuel AA sings, "Imposible el celibato, sin ti me mato" (Celibacy is impossible, without you I'd die). He uses this dramatic word to express that he simply cannot live without his lover's physical affection, perfectly capturing the song's theme of an intense, all-consuming secret romance.
This song is all about a secret, passionate relationship. Anuel AA and KAROL G sing about being lovers who have to pretend they're just friends in public. They tell us, "Ante el mundo somos amigos / Y lo hacemos escondidos" (To the world we are friends / And we do it in secret). The whole world might be gossiping about them, but they don't care and keep meeting up anyway.
What makes this song extra interesting is that Anuel AA and KAROL G were a real couple when they released it! So when they sing lines like "Y nadie nunca lo va saber / Que tú eres mi mujer" (And no one will ever know / That you are my woman), it feels like they are letting us in on their secret. They know people don't want to see them together, but they promise to hide their love and even make a pact "hasta la muerte" (until death). It's a bold declaration of a love that has to stay in the shadows, for now.