What is "ice luge"

n. A large block of ice with a narrow channel carved through it used to cool a beverage for drinking.

An ice luge, martini luge, or shooter-block is a type of ice sculpture made from a large block of ice that has a narrow channel carved through where liquid is poured, such as liquor products. Some are professionally produced from sculpturing or from molds, and some are homemade. Ice luges are sometimes offered in ice bars, and have also been used for serving oysters. Ice luges have also been described as a type of drinking game.