What is finer than frog fur?

"Finer than frog fur" is a colloquial expression used to describe something that is extremely fine or thin. The phrase is believed to have originated in the southern United States and is often used in informal settings to convey the idea of extreme precision or delicacy. It is often used to describe things like a person's hair or a material's texture. The phrase is also sometimes used humorously to describe things that are completely unrelated to fine materials or precision, such as a person's cooking skills or their sense of humor.