Bellaquera is a colloquial and somewhat vulgar term in some Spanish-speaking regions, particularly Puerto Rico, that refers to a strong feeling of sexual desire or horniness.
In the context of the song, the artist uses it to describe an intense sexual urge he feels for the person he's singing about: "Una bellaquera que me dio pa' ti" (A horniness that came over me for you). It's a raw and direct expression of lust, making it a memorable and somewhat provocative word choice that stands out from more common romantic terms.
Marconi Impara's song "Actriz" (Actress) featuring Javiielo, Milly, and Hozwal is all about a secret affair and the lengths the people involved go to keep it hidden. The lyrics are pretty blunt, with the singer telling his lover to deny everything if her partner suspects anything, even if the neighbors hear screams! He tells her, "Dile que tú no eres infiel, que yo a ti nunca te he escrito" (Tell him you're not unfaithful, that I never wrote to you).
It's a wild ride of sneaking around, meeting in secret like a phone's PIN, and using code words. The singer even suggests she tell her partner her friend is coming to pick her up. There's a lot of talk about how intense their connection is, and how they've known each other since college. He's basically saying, if there are no photos, it never happened! The song is pretty explicit about their physical relationship, and the singer doesn't seem to care about the consequences, even mentioning having a "Glock con chipo" (Glock with a chip) if her partner finds out. It's a bold and unapologetic look at a forbidden romance.