The phrase "garage queen" refers to a car that is rarely driven and spends most of its time stored in a garage, often to preserve its excellent condition or collectible value. Full definition
So it might be the ultimate garage queen - not much different than diamond jewelry. (evo.co.uk)
With that in mind, compared to the Golf R, the M5 would be a very expensive garage queen and that's why in the previous post I've said I preferred the R. (evo.co.uk)
Few offered for sale have many miles being likely kept as garage queens. (evo.co.uk)