What is bounce a quarter off meaning?

The phrase "bounce a quarter off" generally refers to a level of cleanliness or tidiness, particularly in households and military settings. It means that the surface is so clean and free from clutter that one could drop a quarter onto it and it would bounce. The phrase can also be used to describe a level of physical fitness or muscularity, meaning that a person's abdomen is so toned that a quarter would bounce off of it.