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Barbour Co. Index (Medicine Lodge, KS) 25 Jan. 1/4: ‘What is a blue whistler?’ ‘You put a heavy charge of powder into your cylinder bore shotgun. Cover it with a wad; on top of that you ram in five buckshot, another light wad, five more buckshot, and still five; another tight wad and you have a blue whistler’.at blue whistler (n.) under blue, adj.1