coachwhip Syllabification: (coach·whip)Pronunciation: /ˈkōCHˌ(h)wip/Definition of coachwhip noun (also coachwhip snake) a harmless, fast-moving North American snake. The pattern of scales on its slender body is said to resemble a braided whip. Masticophis flagellum, family Colubridae coachwhip in other Oxford dictionaries Definition of coachwhip in the British & World English dictionary