Adicto means "addict". This word is a powerful cognate, meaning it looks and sounds similar to its English equivalent, making it easy to remember.
In the song, Prince Royce isn't singing about a typical addiction. He uses adicto to describe his uncontrollable obsession with a woman, singing "Lo reconozco, soy un adicto" (I recognize it, I'm an addict). This dramatic metaphor perfectly captures the feeling of being hopelessly captivated by someone.
In this bachata duet, Prince Royce and Marc Anthony play two friends having a serious talk about a big problem. Prince Royce is the one in trouble, confessing he's completely addicted to women and the nightlife. He's falling for a new girl every day, from a blonde who speaks English and French to a Russian girl he promised to take shopping in Paris. He knows it's out of control, admitting, "Lo reconozco, soy un adicto" (I admit it, I'm an addict).
Marc Anthony plays the concerned friend who sees the damage this lifestyle is causing. He points out that Royce has given everything away and has nothing left, telling him, "Estás desesperado en busca de cariño / Pero te gustan todas / Y no tienes dedo pa' tanto anillo" (You're desperate for affection / But you like them all / And you don't have enough fingers for so many rings). The song is a back-and-forth between Royce's helpless confessions and his friend's worried advice, all set to a smooth dance beat.