A drink made from extremely cheap, yet potent vodka (e.g. Taaka). A shot glass is turned upside-down, and a small amount of vodka is poured onto the bottom of the glass, filling the tiny depression. The person taking the shot then snorts the vodka, once into each nostril.
Wilks: Hey Percy, you should do a Ranger shot!
Percy: This sounds like a terrible idea, but ok.