unlicensed, unregulated, usually owned by the operator. Most often applied to a taxicab or truck, although originally to a racehorse owner/jockey US, 1951.

meddling, nosy, officious BARBADOS, 1965

in circus and carnival usage, an undependable employee, especially a drunk US, 1981.

in trucking, an owner-operator who works independently US, 1946