Amañada is a fantastic colloquial term, especially popular in Colombia, where the artist Beéle is from. It doesn't have a perfect one-word translation, but it generally means being accustomed to, attached to, or even spoiled by someone else.
In the song, Beéle sings, "Te tengo amañada y no lo quieres aceptar" (I have you attached to me, and you don't want to accept it). He's playfully teasing his love interest, suggesting she's so used to his affection that she can't live without it, even if she won't admit it. It's a charming word that perfectly captures the song's fun, romantic chase.
Colombian artist Beéle kicks off this track by admitting things have been tough: "En medio de lo oscuro / No ha sido fácil" (In the middle of the darkness / It hasn't been easy). His solution? To completely lose himself in someone's kisses. He's making a big promise, swearing that their connection is "brillantes como diamantes, lo nuestro es puro" (brilliant like diamonds, what we have is pure). He's tired of games and pride getting in the way of what he feels is a special relationship.
The whole song is built around his confident plan for seduction. He repeats his main idea over and over: "Porque si te toco / Y tú no dices nada / Poco a poco / Te voy a enamorar" (Because if I touch you / And you don't say anything / Little by little / I'm going to make you fall in love). He thinks she's already into him but just won't admit it, saying "Te tengo amañada y no lo quieres aceptar" (I have you attached to me and you don't want to accept it). It's a classic Reggaeton theme of playful pursuit, where he's sure he can win her over if she just gives him a chance.