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It is actually a "horse's arse". In pantomime, the most ignominious part was playing the backside of a panto horse. So, if you were called a "horse's arse", you were as low as you could get.
Must be because of all those jealous mules I suppose.
Heres a picture of a few of them.

Mules are the offspring of a male (jack) ass and a female (mare) horse (from dictionary.com). So a horse's ass would be a male donkey kept to impregnate mares - like a gigolo.
Though I haven't found a definitive answer, my guess is that it is derived from the fact that you would have to be the stupid one to wear the back half of the costume. :)
not sure of origin but used in comedy, as in [ you sir, are a horses ass] very funny, python i think.
Not for sure, but they use a horse's body parts for a few things, such as, hung like a horse!
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