"Billie the Kid" ba kalmar da aka sani ba ce ko jumla a cikin harshen Ingilishi. Duk da haka, "Billy the Kid" sanannen kalma ne wanda ke nufin wani ɗan doka ɗan Amurka mai suna William H. Bonney, wanda kuma aka sani da Henry McCarty. Ya kasance mai aiki a ƙarshen 1800s a cikin Tsohon Yammacin Amurka kuma yana da hannu a cikin tashin hankali da yawa. Ya zama gwarzon jama'a kuma almara na Wild West, kuma labarinsa ya kasance batu na littattafai da fina-finai da sauran nau'o'in al'adu masu yawa.