Stearns: An OED etymology (PG-13)

“[f. BULL n.¹ + SHIT n.] course slang

1. Rubbish, nonsense

c1915 WYNDHAM LEWIS Let. (1963) 66 Eliot has sent me Bullshit and the Ballad for Big Louise. They are excellent bits of scholarly ribaldry. 1928 E. E. CUMMINGS Enormous Room vii. 194 When we asked him once what he thought about the war, he replied, ‘I t'ink lotta bullsht.’ 1953 G. LAMMING In Castle of Skin vi. 135 Some say they had no time for all that bullshit. 1961 R. KEE Refugee World xii. 130 ‘What do you think of the criticisms..?’ ‘Sheer bullshit, frankly.’ 1969 P. ROTH Portnoy's Complaint 97, I swear to you, this is not bullshit or a screen memory, these are the very words these women use.” [Bold mine]

The first instance—Wyndham Lewis’s—is referring to TSE’s “The Triumph of Bullshit” which, according to Inventions of the March Hare, was dated Nov. 1910, was written in pencil, and was never published.

TSE invented the term ‘bullshit.’