The term 'Casual Negative' is used to describe a type of response that is neither positive nor negative. It is often used in casual conversations as a way to express indifference or lack of interest. The two most common responses to this type of statement are 'NAH' (3 letters) and 'Uhuh' (4 letters). Both of these responses indicate that the speaker is not interested in the topic being discussed, but they do not necessarily express a negative opinion.