Golpe literally translates to "hit" or "blow," but in this song, it appears in the idiomatic expression "alerta de golpe," which means "scam alert." The double meaning adds an extra layer of playfulness to the warning.
In the song, the line "Alerta de golpe" ("Scam alert") sets a fun, cautionary tone, warning listeners about falling for someone charming but ultimately untrustworthy in love.
Ana Castela's "Alerta De Golpe" is a super fun warning about falling for a certain type of charming, yet ultimately troublesome, person. She's basically saying, "He just met you and is already calling you 'amor' [love]? Run!" The song describes this person as someone who will trick you, but you'll still like it because "ele é ruim de mexer, mas é bom de beijar" [he's hard to deal with, but good to kiss]. It's all about that irresistible bad boy who's "o melhor pior tipo de gente pra se apaixonar" [the best worst kind of person to fall in love with].
She gives some pretty specific characteristics to watch out for: if he "usa chapéu e bota e beija mordendo" [wears a hat and boots and kisses by biting], or has a "corpo tatuado e uma pegada com talento" [tattooed body and a talented touch], then you should "passa longe desses moreno'" [stay far away from those dark-haired guys]! Ana warns that these types are "os pior que 'tá tendo" [the worst there are], promising "um dia de prazer pra seis de sofrimento" [one day of pleasure for six of suffering]. So, it's a catchy and relatable anthem for anyone who's ever been tempted by a charming troublemaker!