a television or radio program or motion picture about the Wild West, often presented serially and usually dealing with adventures of cowboys, gunmen, gold prospectors, etc.Compare Western(def 8).
Before X Was X: The Dark Horse Story Of The 24th LetterSince its inception, the letter X has struggled to establish its own identity, so it may be no coincidence that X is commonly used to represent the unknown in both language and mathematics. But, how was it created?
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Examples from the Web for horse opera
Professor Cramer conducted a side-show in the wake of a horse-opera, and the same sojourned at Colusa.The Fiend's Delight|Dod Grile
She was quite ashamed that he detected her once in going to the Horse-Opera, he must think her taste so low.
British Dictionary definitions for horse opera
informal another term for Western (def. 4)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012