Invicta means "undefeated" or "unbeaten." It's a powerful adjective used to describe someone who has never lost.
In "La Difícil," Bad Bunny uses this word to create a strong image of the woman he's singing about, comparing her to a famous fighter: "Invicta como Khabib" (Undefeated like Khabib). This modern pop culture reference makes the word extra memorable and highlights her independent and winning nature.
Bad Bunny is telling a story about a woman who completely runs the show. She's the one who decides when they meet up, as he says, "Ella desaparece, pero aparece cuando le dan ganas" [She disappears, but appears when she feels like it]. She might act uninterested, but then she'll call him late at night. The song's title means "The Difficult One," and he describes her playing hard to get: "Se hace la difícil, pero se va" [She plays hard to get, but she goes for it]. She's clearly over traditional relationships, with Bad Bunny noting, "De las relaciones se cansó / La última que tuvo la atrasó" [She got tired of relationships / The last one she had held her back].
This woman is presented as a total powerhouse. You'll find her in the VIP section, looking "Modelo como Hadid" [A model like Hadid] and being "Invicta como Khabib" [Undefeated like Khabib], a cool reference to the MMA fighter. She's so in-demand that she leaves over a hundred guys on read. She has everyone's attention, both men and women: "Tiene a to' los nenes locos y a las nenas locas / Todos quieren besarle la boca" [She has all the boys crazy and the girls crazy / Everyone wants to kiss her mouth]. She is confident, independent, and lives life entirely on her own terms.