Skinning was the act of removing the skin from an animal.
According to legend, Kahless the Unforgettable skinned the Serpent of Xol with the Sword of Kahless. (DS9: "The Sword of Kahless")
In 2266, James T. Kirk promised Montgomery Scott that they would see the jackass known as "Leo Walsh" skinned. (TOS: "Mudd's Women")