"There is a real place called Hoople, in North Dakota, spiritually not too far removed from the real Deadwood in South Dakota, though the two places are at opposite corners of the states. Hoople, however, is a tiny place even today (population about
300) and can hardly have been significant enough in 1876—even if it existed then—to be the source of a deprecatory comment."
"According to Professor Jonathan Lighter’s Historical
Dictionary of
American Slang, it probably derives from Major Hoople, who was a character in a once-famous cartoon strip entitled Our Boarding
House, which featured the goings-on at Martha Hoople’s rooming establishment. It was written and drawn by
Gene Ahern and began to appear in
September 1921..."
"...It would not have been possible for
Al Swearengen (Deadwood) to have used the word in 1876,
40+ years before Gene Ahern invented the character (Major Hoople) and a hundred years before it was first recorded in print. The producer and head of the scriptwriting team (HBO: Deadwood), David Milch, has been reported as saying in essence that he picked something out of the air to serve as a suitable insult without great concern for its etymology. It seems he must have heard it somewhere and it came conveniently back to mind while writing the scripts. It’s definitely an anachronism."