The song "Tudo de Bom" by GAAB talks about a casual and intimate relationship between two people. The lyrics describe how the singer is ready to make love and enjoy a special night with their partner, even though they are not in a committed relationship. The song expresses the excitement and passion of being with someone special, and the desire to show affection and care for them. It also conveys the appreciation for the partner and the special moments shared together. Overall, the song portrays a sense of love, affection, and genuine connection between two people.