Vacile is a colloquial term, especially in some Latin American countries, that refers to casual flirting, hanging out, or having fun without serious commitment. It's more than just
"Priti" is Danny Ocean and Sech's play-by-play of getting caught completely off guard by someone. The hook says it outright: "Nunca me había pasado esto" ("This had never happened to me before"), and the rest of the first verse keeps admitting the damage — he's had a few drinks and it shows in his texts ("Estoy borracho y se nota en los textos," "I'm drunk and it shows in the texts"), and he can't hide it however hard he tries ("Es que lo trato de esconder, pero se nota," "It's that I try to hide it, but it shows"). By the second verse the infatuation has turned into a plan: he's ready to call his mom and tell her ("Ya estoy listo pa' llamar a mi mamá y poder decirle," "I'm ready to call my mom and be able to tell her"), while still checking whether she's in for something real or "¿O solo quieres vacile?" ("Or do you just want a fling?"). It's a song about the exact moment a crush turns into a decision.