Torturar means "to torture." It sounds intense, but here it is used in a dramatic, almost playful way to describe mild emotional discomfort rather than real suffering.
In the line "Não quero torturar meu coração" ("I don't want to torture my heart"), the singer jokingly exaggerates how painful it would be to do something he simply does not feel like doing.
Ever felt like you had to act tougher than you really are? In "Minha Fama De Mau," Erasmo Carlos plays a character who's trying so hard to be a bad boy that it's getting in the way of his relationship. His girlfriend wants to do normal things, like go to the cinema, but he refuses. Why? As he says, "é que eu tenho / Que manter a minha fama de mau" [it's just that I have / to maintain my bad boy reputation]. He won't even apologize when she gets upset, because saying sorry is a "normal thing" and he's anything but normal... or so he wants everyone to think.
The song gets even funnier with a spoken dialogue between him and guest singer Rita Lee. He lays the tough-guy act on thick, telling her, "Seu lugar é na cozinha" [Your place is in the kitchen]. She's not having it and calls him out. But the whole act falls apart at the end. He gives in, agrees to go to a cowboy movie with her, and then sweetly calls her "Minha rainha" [My queen]. It's a playful song that makes fun of the pressure to have a tough-guy image, showing the soft heart underneath the act.