It's pretty self explanitory. They're chocolates that are filled with liquor. The store I work in sells them from a company called Turin that fills them with Kahlua, Baileys, and Cuervo.
Well... it's chocolate with a hole in the center which is filled with some form of flavorful liqour (whiskey, schnaps, irish cream, ...). I especially like the kinds with milk chocolate and almonds filled with pear or cherry schnaps.