Bombast. Slang.

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1865.  I venture to say that if you sarch the earth all over with a ten-hoss power mikriscope, you won’t be able to find such another pack of poppycock gabblers as the present Congress of the United States of America.—C. F. Browne, ‘Artemus Ward on his Travels,’ i. 3.

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1892.  Their wails were all what the boys call “poppycock.”The Nation, N.Y., Nov. 24, lv. 386/1. (N.E.D.)

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