This refers to a specific activity where one person (often the dominant or "master") lifts and carries another (the ponygirl) as part of a power dynamic, trust exercise, or performance. This can be part of a broader BDSM (Bondage, Discipline, Dominance, Submission, Sadism, and Masochism) context or a standalone activity within consensual role-play.
Power Pony Push Riding Toy - Crystal: Steel Pedal & ... - Target