cow ‧ boy /ˈkaʊbɔɪ/ BrE AmE noun [countable]
1 . in the US, a man who rides a horse and whose job is to care for cattle
2 . British English someone who is dishonest in business, or who produces very bad quality work:
a firm of cowboy builders
3 . cowboys and Indians a game played by children who fight while pretending to be cowboys and Native Americans