The instructions call for two watermelons, of similar shape and size. Step one is to shave off the exterior of one of the watermelons, first using a knife and then smoothing the surface with a dish-washing sponge. The second step is to cut the other watermelon in half and then gut it as one normally would.
Combining the shaved watermelon with the hollow shell should leave the individual with a watermelon that appears to have been “skinned.”