This is a ride-or-die love song from Mexican reguetón, and the hook says it plainly: "Que no se metan contigo, o les damos pelea" (nobody better mess with you, or we'll give them a fight). "La vamos a prender" is slang for "we're going to light it up", meaning party hard or make it big, "aunque nadie nos crea" (even if nobody believes in us). Bellakath opens with the vow "Nunca te voy a mentir, te seré fiel hasta el fin" (I'll never lie to you, I'll be faithful to the end).
Dani Flow's verse is the bad boy thanking his girl for sticking around: "Gracias por quedarte con el malo" (thanks for staying with the bad guy). He calls her "reinota" (big queen) and promises her a castle built from "cemento Cruz Azul", a real Mexican cement brand, which is a very funny way to say "solid". "Mi real" means "my real one", someone loyal since "antes del dinero" (before the money). The lines get rough from there: "Por ti robo y mato" (for you I rob and kill), and Bellakath answers "Tú eres mi maleante y yo soy tu prepago" (you're my thug and I'm your call girl), a blunt bit of gangster role-play that is a lot to say out loud. "Te mando la ubi" is short for ubicación, "I'll send you my location".
The outro sums up their pitch: "Porque cuando no había fama, ya había promesas" (because before there was fame, there were already promises), and the song calls itself "un antídoto de lealtad" (an antidote of loyalty).