Young T.S. Eliot Writes “The Triumph of Bullsh*t” and Gives the English Language a New Expletive (1910)

Josh Jones at Open Culture.

Some surmise others must have used the word before.

"Perhaps. But according to Wyndham Lewis and the OED, he was the first to use the word on record."
...
"It’s language only slightly more exaggerated than some of Mark Twain’s or Herman Melville’s characterizations, marking Eliot’s kinship with a particularly American sense of humor."

See works by Eliot, Dante, and Tradition and the Individual Talent, in Gateway to the Great Books (10 Vol., 1963) volume 5, and The Waste Land, in Great Books of the Western World (second edition, 1990) volume 60