Afoito means bold, rash, or eager. It's a less common adjective that perfectly encapsulates the passionate and somewhat reckless nature of the love described in the song.
In the context of "Amor Afoito" (Bold Love), it suggests a love that is daring, perhaps a little impetuous, and full of fervent desire. It's a word that immediately grabs attention and hints at the intense emotions explored in the lyrics.
Ana Moura opens "Amor Afoito" (Reckless Love) with a condition, not a declaration. "Dou-te o meu amor" (I give you my love), she sings, and then immediately narrows it: it only holds "se me souberes pedir" (if you know how to ask for it). She isn't handing her heart over freely; she's testing whether the man asking for it actually deserves it, warning him he'll have to prove he's worth "mais que o que já mostraste ser" (more than what you've already shown yourself to be).
The chorus is where the title earns itself. She's already read her own fortune, "li ontem a sina" (I read the fate yesterday), and gambles on it anyway: "se quiseres arriscar" (if you want to risk it), "não temas a vida" (don't fear life). Love here is "este fogo" (this fire), and she refuses to be afraid of it even knowing exactly what it might cost her. That's the whole song in one move: eyes open, heart out anyway.