Originally, "muh" was a contraction of "muwahahaha," a sort of quick way of adding diabolical laughter to a phrase. It now has a number of meanings, and is often used as a random
interjection, or just dispersed throughout a sentence. At the end of a sentence, it adds an emphatic note to the whole. Standing alone as an adjective, it means something so bizarre or intrisically unique that it can't be described any other way. In front of an adjective or adverb, it acts as an
intensifier. Muh is also
associated with a pink paranoid chihuahua, although experts haven't yet determined just how this applies. Muh can also be used as a greeting, a challenge, a threat, or just something fun to scream at the top of your lungs (an act referred to as a "screamuh").