a man who herds and tends cattle on a ranch, especially in the western U.S., and who traditionally goes about most of his work on horseback.
2.
a man who exhibits the skills attributed to such cowboys, especially in rodeos.
3.
Chiefly Northeastern U.S.a reckless or speedy automobile driver.
4.
Informal.a reckless or irresponsible person, especially a show-off or one who undertakes a dangerous or sensitive task heedlessly: They put foreign policy in the hands of cowboys.
5.
(during the American Revolution) a member of a pro-British guerrilla band that operated between the American and British lines near New York City.
1725, "boy who tends to cows," from cow + boy. Sense in Western U.S. is from 1849; fig. use by 1942 for "brash and reckless young man" (as an adj. meaning "reckless," from 1920s). Cowhand is first attested 1852 in Amer.Eng. Cowpoke (1881) was originally
restricted to the cowboys who prodded cattle onto railroad cars with long poles.
n. a reckless and independent man; a reckless driver. (Also a term of address.) : Come on, cowboy, finish your coffee and get moving.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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cowboy definition
[Sun, from William Gibson's cyberpunk SF] Synonym for hacker. It is reported that at Sun this word is often said with reverence. [Jargon File]