If a piece of information comes straight from the horse’s mouth, that generally means it’s a reliable tidbit, shared from an authority who has first-hand knowledge of a situation. The familiar turn of phrase gets a new, literal translation–the skinny comes directly from the horses’ mouths–in a campaign from tourism bureau VisitLEX. Psychic medium Carrie…

(SOURCE) https://www.adweek.com/agencies/a-pet-psychic-captures-reviews-of-kentucky-that-come-straight-from-the-horses-mouth/