A cowboy was an individual that tended cattle. They had their origins in the 19th century American West.
When they visited Tombstone in 1881, Steven and Dodo dressed as fancy cowboys. (TV: The Gunfighters)
Lassos were used by cowboys to catch cows. (COMIC: Ripper's Curse)
Although he was from 1746, Jamie McCrimmon knew what a cowboy was. (AUDIO: House of Cards)