horseshit noun 5exclamation 1 noun5 •(vulgar) Horse feces / manure.The aroma was a mix of cedar, hay and horseshit but somehow, Betty found it pleasantly intoxicating. — 2012 •(slang, vulgar) Blatant nonsense, more likely stemming from ignorance than any intent to deceive.He thinks vinegar is alkaline? Don't you realize that's horseshit? •(slang, vulgar) Deliberate falsehoods (lies); manipulations or cons (fraud).He claims that he wasn't at that meeting? Don't you realize that's horseshit? •(slang, vulgar) Synonym of bullshit (figurative senses). •(slang, vulgar) Serious harassment or abuse.That scumbag dumped a whole carload of horseshit over his associates. exclamation1 •(slang, vulgar) Synonym of bullshit.He says he'll pay up next week. Horseshit!