Definition: empty talk or writing; nonsense
It is somewhat ironic that poppycock is occasionally used as a jocular sort of euphemism, considering its origins. The word comes from a Dutch word meaning “soft dung” (pappekak), which tends to be the sort of word people often try to avoid when being polite.
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.
—Charles Farrar Browne, Artemus Ward, 1890