Muser's Mumbling is a term used to describe the act of mumbling or speaking in a low, indistinct voice. It is often used to describe someone who is not speaking clearly or is speaking too quietly to be heard. The term is derived from the word 'MUSE, ' which means to think deeply or ponder. Muser's Mumbling is often used to describe someone who is lost in thought and not paying attention to their surroundings.