This is a green mug shaped like a standing Tiki with brow line covering eyes and an open grimacing mouth lined with teeth. This woodgrain Ku was manufactured by Tiki Farm for Wilfred's Lounge in Napa, CA. The "Woodgrain Ku" is a customizable design not exclusive to a single locale, one of Tiki Farm's "Wiki-Wiki" mug line for new businesses that want to produce branded mugs quickly without waiting a long time for production of brand-new designs.
Wilfred's uses this mug to serve the "Pagan Ritual" on their menu, made with white rum, pineapple, grapefruit, lime, banana liqueur, and gold fassionola.