Gatinha literally means "kitten" but is commonly used in Brazilian Portuguese as a slang term to describe a "cute girl" or an attractive woman. It's a playful and affectionate term.
In the song, the lyric "é mas é bem gatinha ele tava com a mina dele me olhou de canto eu percebi" (yeah, but she's really cute, he was with his girl, looked at me from the corner of his eye, I noticed) uses gatinha to describe the singer herself, highlighting her attractiveness and confidence. This dual meaning makes it an interesting and culturally relevant word to learn.
Get ready for a song with a bold and confident attitude! In "Trabalho Lindo," the narrator sees a man who is already with his girlfriend, but that doesn't stop her. They share a look, and she knows exactly what she wants.
She proudly calls herself the "rainha das Amantes" (queen of lovers/mistresses) and invites him to leave his partner and spend the night with her. She isn't worried about the risks, saying, "não tô nem aí se tu tá Correndo Perigo" (I don't even care if you're in danger). The repeated line "sempre faz trabalho" (always does the work) suggests she sees her role as a kind of skilled job, promising to do things his girlfriend doesn't.