Disfarce translates to "disguise" or "pretense". It's an interesting word because it captures the central theme of the song: the struggle to hide true feelings.
The lyrics repeatedly mention "Teu sorriso é só disfarce" (Your smile is just a disguise) and "Meu sorriso é só disfarce" (My smile is just a disguise), highlighting the mutual attempt by both lovers to conceal their deep affection and pretend indifference. This word beautifully encapsulates the emotional tension and the game of denial played out in the song.
This is a duet about two people who both know exactly how the other one operates, and it's driving them crazy. The title question, "Quem de nós dois" [Which of us two], never gets answered, because admitting you still love someone means going first, and neither of them wants to blink.
Paulo Gonzo opens by calling out the act before it starts: "Eu sei você vai rir da minha cara" [I know you're going to laugh in my face]. He already knows her tells, telling her flat out "Teu sorriso é só disfarce" [Your smile is just a disguise] for feelings she's pretending not to have. It's a strange kind of comfort, being so familiar with someone that you can see straight through their front door. Ana Carolina answers with the same problem from her side, insisting she's over it while circling right back. However hard either of them tries to walk away clean, the song keeps landing on the same line, "Acabo entrando sem querer na tua vida" [I end up in your life without meaning to], like gravity they'd rather not admit is still working.