pop·py·cock (pŏp'ē-kŏk') n. Senseless talk; nonsense.
[Dutch dialectal pappekak : pap, pap (from Middle Dutch pappe, perhaps from Latin pappa, food) + kak, dung (from kakken, to defecate, from Middle Dutch kacken, from Latin cacāre; see kakka- in Indo-European roots).]
n. nonsense. (From Dutch.) : That's nothing but poppycock.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
poppycock
1865, probably from Du. dialect pappekak, from M.Du. pappe "soft dung" (see pap) + kak "dung," from L. cacare "to excrete."