“Howdy, XO,” he drawled. The old west affectation common to everyone from the Mariner Valley annoyed Holden. There hadn’t been a cowboy on Earth in a hundred years, and Mars didn’t have a blade of grass that wasn’t under a dome, or a horse that wasn’t in a zoo. Mariner Valley had been settled by East Indians, Chinese, and a small contingent of Texans. Apparently, the drawl was viral. They all had it now. “How’s the old warhorse today?”

James S.A. Corey, Leviathan Wakes