Enfiestó comes from fiesta and is an informal way to say someone began partying or really got into the festive mood. In the song, "ya se enfiestó el carnal" means that the guy is fully ready to celebrate, making this lively slang word a memorable way to learn how Spanish speakers turn nouns into expressive verbs.
Jasiel Núñez’s song is a loud, playful celebration of a guy who has decided the night is his. “Ya se enfiestó el carnal” means “the guy is partying now,” with carnal used as casual Mexican slang for a close friend or bro. He calls for champagne, says he is extra happy, and moves between wine, the beach, the sea, and the boulevard while waiting for something good to happen. The mood is pure excess: he dresses exactly as he wants, smells like Valentino fragrance, and says, “Y gasto, no me lo acabo” [“I spend, and I never run out of it”]. It is a funny, confident image of someone treating an ordinary outing like a personal event.
Then the party gets even wilder. He lights a blunt, drives his “G-Wa,” and describes himself as “placosón” [very flashy or showy]. He talks about choosing women from Instagram, ordering a “lavadito de fresa” [a strawberry-flavored drink or preparation], and being so far into the party that “del avión no quiere bajar” [he does not want to get off the plane]. Here, “plane” works as slang for his elevated, spaced-out state, helped by the blunt and the drinking. The repeated “algo va a pasar” [“something is going to happen”] keeps the song moving: everyone knows the night is heading toward more celebration, more spending, and more trouble.