from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang A movie about frontier or cowboy life; a western.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A movie or television show about cowboy or frontier life; a western movie.
From the prominence of horses, known for their taste for oats, in such films.(American Heritage® Dictionary of the English Language, Fourth Edition)