This is a mug shaped like a Jack-O-Lantern with a skeleton body, wearing a Hawaiian style shirt (plain shirt in this case) and throwing up the shaka sign with his left hand.
*NOTE: There was also a slightly more expensive Decal Edition of this design with different themed decals on the shirts (marijuana leaves, ouija board symbols, and flamingos). Shirts also came in different colors for these decal editions (green, red, and blue).