Cattle care??

Po’o Wai U
This event is found uniquely at Hawaiian Rodeos and has evolved from when cowboys would rope wild cattle in the mountains and tie them up so that they could continue to gather more cows and later lead them to their pasture. This event requires the contestant to rope a steer and get him to a Y shaped post (called an amana) placed in the middle of the arena. Once the steer is roped the cowboy pulls the animal close to the Y and he flips his rope into the Y, the steer is held tight to the Y by the horse and then the cowboy dismounts and ties the animal with another rope up close to the Y post. This is a timed event.

Po'o in Hawaiian means head and Wai would be water so my guess as far as translation would be water head?? I will ask my uncle tommorow when I see him and will get back if my translation is wrong or if I can get more better information from him.