1. A hired hand who tends cattle and performs other duties on horseback; SYN. cowpuncher, puncher, cowman, cattleman, cowpoke, cowhand, cowherd.
2. A performer who gives exhibitions of riding and roping and bulldogging; SYN. rodeo rider.
3. Someone who is reckless or irresponsible (especially in driving vehicles). cow-boy

(Slang) Cowboy.