windshield cowboy
n.— «These weekend ranchers are also called “windshield cowboys” because they use sack feed instead of graze and have trained their cattle to come at the sound of an auto horn.» —“Cowboys—the real kind—are a vanishing breed” by David F. Salisbury in Denver, Colorado Christian Science Monitor (Boston, Massachusetts) May 21, 1981. (source: Double-Tongued Dictionary)