Green’s Dictionary of Slang

rung adj.

[ring v. (1k)]

of cars, supplied with false plates, documents etc. for use in a robbery.

Miss McIntosh ‘Vehicles (Crime) Bill’ in UK Parliament House of Commons Standing Committee A 🌐 The Government are trying to meet the anxieties of individuals who may unwittingly buy a ‘rung’ car, if that is the correct term.