BUCKAROO
vaquero, buckaroo, buckeroo
(noun) local names for a cowboy (‘vaquero’ is used especially in southwestern and central Texas and ‘buckaroo’ is used especially in California)
Source: WordNet® 3.1
Etymology
Noun
buckaroo (plural buckaroos)
A cowboy; specifically, a working cowboy who generally does not partake in rodeos.
One who sports a distinctive buckaroo style of cowboy clothing, boots, and heritage.
A style of cowboy boot with a high and uniquely tapered heel.
A reckless, headstrong person.
(slang) A dollar; a buck.
Source: Wiktionary