rat bike
n.— «Keith Bennett, 27, an Englishman now living in Lawrenceville, will be gunning for his third “Rat Bike” trophy in four years. “Everyone votes on what they think is the worst bike there.”» —“The Unapproachable Norton” by Jack Wilkinson Atlanta Journal-Constitution (Ga.) Mar. 2, 1986. (source: Double-Tongued Dictionary)