Labia is a popular colloquial term for 'smooth talk' or the 'gift of gab'. It refers to the special skill of using charming and eloquent words to persuade, flirt with, or sweet-talk someone.
In the song, Bad Bunny sings, "Yo no voy con labia", which means "I don't do smooth talk". He's saying he's direct and honest about his intentions, warning the other person not to expect romantic sweet-talk from him.
Bad Bunny and Daddy Yankee team up on "La Santa" to deliver a blunt reality check to someone catching feelings after a casual fling. The title translates to "The Saint," and the main message is simple: stop pretending to be innocent when you knew the rules from the start. Bad Bunny calls it out immediately, singing "Tú no eres una santa, ni yo soy un santo / Nos conocimos pecando" ("You are not a saint, nor am I a saint / We met while sinning"). He warns her that this arrangement was only ever "pa' jugar" ("to play around"), so trying to change him into relationship material now makes zero sense.
Daddy Yankee jumps in to double down with zero sweet talk, straight-up telling her "Yo no voy con labia" ("I don't do smooth-talking / sweet talk") and "El romance no es mi área" ("Romance is not my area"). He even jokes about keeping his heart on ice: "Con el corazón dentro de la nevera / Lo tengo frío, frío" ("With my heart inside the fridge / I keep it cold, cold"). Both artists remind her that she loves the nightlife and party dancing just as much as they do ("el perreo te encanta"), making this track a direct, high-energy anthem about leaving Cupid behind and keeping things strictly no-strings-attached.