Pronunciation: [hˈɔːsfɪðˌɜːsɪz] (IPA) 
The spelling "horsefeatherses" may seem strange, but it is actually a valid form of the word "horsefeathers". The root word refers to nonsense or meaningless talk. The added "-es" is a plural suffix, and the spelling of the final "-es" is uncommon, but still correct. In IPA notation, the word is transcribed as /hɔrsˌfɛðərˈsɛz/, with emphasis on the second syllable and the final "s" pronounced as /z/.
The word "horsefeatherses" does not have its own distinct etymology because it is a combination of two words: "horsefeathers" and "es".
"Horsefeathers" is a slang term that originated in the late 19th century in the United States. It is used to express disbelief, nonsense, or absurdity. The term likely originated from the idea of feathers being a light, inconsequential material, and when applied to a horse, it implies something trivial or worthless.
The suffix "es" added to "horsefeathers" is used to denote plurality or possession in English. In this case, "horsefeatherses" is used humorously or playfully to refer to multiple instances or examples of horsefeathers, extending the already playful and exaggerated nature of the term.
