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\ ˈhȯr-səz- 
\
\Definition of horse's ass
often vulgar
: a stupid or incompetent person : blockhead
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More Definitions for horse's ass
horse's ass
nounEnglish Language Learners Definition of horse's ass
US, informal + impolite : a very stupid or foolish person
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The first known use of horse's ass was circa 1865
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