Hogfather

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“What are you waiting for? Christmas?” is a mild taunt used to encourage someone to start doing something. It is, for instance, what Duke Nukem in the computer game Duke Nukem 3D says after the player has been inactive for a while. Given Terry Pratchett’s love of other games in that genre (such as Doom and Tombraider) a familiarity with Duke Nukem may perhaps have contributed to his use of the phrase here.