Merriam Webster says:
Origin of POPPYCOCK
Dutch dialect pappekak, literally, soft dung, from Dutch pap pap + kak dung
First Known Use: 1865
It gets the job done without any false dignity. : /
Well, now. That’s very interesting! I may have to substitute “poppycock” for more contemporary scatological exclamations, and move “balderdash,” “bilge,” and “hogwash” down the list.
Good for Rick!