I don't think that this is translated correctly because "meu mao" means that your lips and the muscles around your mouth are trembling, almost to the point where you couldn't talk because you're full of emotion. Yet, whinning, according to Google Dictionary, means give or make a long, high-pitched complaining cry or sound, which has totally different meaning. Therefore, you could not conclude that "meu mao" is the same thing as "whining voice". I think that English doesn't have the exact word for "meu mao".