The story
In sense of lies or nonsense: by analogy with horseshit and bullshit.
Etymology from Wiktionary, CC BY-SA 4.0.
horse piss
Today it means: Used other than figuratively or idiomatically: see horse, piss: urine from a horse. Full definition →
Today it means: Used other than figuratively or idiomatically: see horse, piss: urine from a horse. Full definition →
In sense of lies or nonsense: by analogy with horseshit and bullshit.
Etymology from Wiktionary, CC BY-SA 4.0.