Antojo translates to "craving" or "whim". It's a fantastic word that describes a sudden, intense desire for something, often used for food but applicable to anything you strongly want.
In "Mas Que Tu", Ozuna sings "De tus besitos yo tengo antojo" (I'm craving your little kisses). He uses this word to express a deep, almost impulsive longing for his lover's affection, making it much more powerful than just saying "I want your kisses". It's a playful yet passionate way to talk about desire.
Ozuna is completely obsessed with someone in this track, and he's not shy about it. The whole song is a list of reasons why she's better than anyone else. He tells her, "Nadie la tiene más que tú" [Nobody has it more than you], and he really means it. He wants to see the world through her eyes and hear what she hears, a really sweet way of saying he wants to understand her completely. He even calls her his moon, saying, "Mi Luna, solo contigo, se llena" [My Moon, only with you, it becomes full].
But it's not all just sweet romance. He gets pretty direct about her looks, calling her a "silueta de sirena" [siren's silhouette], and Kapo's verse adds a much more intense, physical layer to the song. He describes how she poses for him and how he's the one who gives her a good time. There's a moment of doubt when Ozuna asks, "¿pero eres sincera?" [but are you sincere?], but it passes quickly. Mostly, this is a song about being totally captivated by someone, from their healing kisses that "Borra todos mis cicatriz" [erase all my scars] to the way they dance.