Literally the feces of a horse; used as a vulgar slang term meaning obvious lies or complete nonsense.
Compound word from 'horse' and 'shit.' The slang usage emerged because horseshit is so obviously unpleasant and worthless—making it a perfect metaphor for lies and garbage.
Many of our strongest curse words come from honest farm reality—horseshit, bullshit, crap—because farmyard life was unpleasant and common enough that farmers needed colorful words for it!
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