1. superlative form of horsy; most resembling, characteristic of, or relating to horses
Usage: informal; often used to describe appearance, interests, or behavior
2. superlative form of horsy; most strongly interested in or devoted to horses and horse racing
Usage: informal

Examples

• She had the horsiest laugh of anyone in the room—loud and braying.
• His horsiest feature was his long, narrow face.
• The horsiest members of the club spent every weekend at the stables.
• That was the horsiest outfit I've ever seen, complete with riding boots and a polo shirt.
• Among all her siblings, she was the horsiest, having won multiple equestrian competitions.