Cafeína is the Spanish word for "caffeine", the stimulant found in coffee and tea.
In this bachata hit, Prince Royce uses a brilliant metaphor, calling his lover "La cafeína de mi corazón" (The caffeine of my heart). This poetic line describes how she excites him, makes his heart race, and gives him a rush of energy, just like a strong cup of coffee. It's a clever and modern way to express the thrilling effect she has on him.
Prince Royce is completely hooked on a woman who is not what she seems in his bachata hit, "Carita De Inocente." He sings that she has a "carita de inocente" [little innocent face], but he knows the truth: she's actually a "diabla bien vestida" [a well-dressed devil]. It's a classic setup—the good girl who is secretly wild—and Royce sounds like he loves every minute of it.
He complains that whenever he tells her he loves her—"Si te digo que te amo"—she takes advantage of him. But what does she do? She just gives him what he wants with even more passion! He says she has her "trucos" [tricks] and that because of her, "hace tiempo yo no duermo solo" [it's been a while since I've slept alone]. He calls her wild and different, the "cafeína de mi corazón" [caffeine of my heart], which is a great way to describe someone who keeps you up all night.