that's bullshit 废话；那是胡说八道；这是胡说

【例句】
That's bullshit! I don't believe a word of it.
屁话！我一个字也不信。

That's bullshit. I just don't think it would be the end of the world like you do.
胡说八道，我不认为这将是世界的尽头像你一样