Russian translation: "Что ты говоришь" или "Что вы говорите"
Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: My colleagues are absolutely right. Here is some clarification:
Что ты говоришь? Shto ty govorish? (Single)
Что вы говорите? Shto vy govorite? (Plural)
Что Вы говорите? Shto vy govorite? (Single, Formal)