"Cuéntale" (Tell him) is a cheeky, flirty song where BM plays the secret lover pushing a girl to come clean with her boyfriend. He keeps repeating the order: "Cuéntale, ya es momento de que lo sepa" (Tell him, it's time he knew). What should she tell him? That she is bored and dying to break up ("mueres por cortarlo", you're dying to cut him off), and that "ahora soy tu amante secreto" (now I'm your secret lover).
It gets bolder as it goes. He says they met perreando (dancing reggaeton style, grinding), and that he took off her "Calvin Klein". La troca is Mexican slang for a pickup truck, and you can guess why it was moving "anteayer y anoche" (the day before yesterday and last night). The best line is pure confidence: "Que quieres que te haga como diez babies" (that you want me to give you like ten babies). It closes with a shout out, "arriba Sonora" (up with Sonora), the northern Mexican state.