The phrase "oily rag" is often used to describe a piece of cloth or rag that has oil on it. It can also be used metaphorically to describe a person or situation that is dull, lacking energy, or uninteresting. Full definition
I saw advertised in the automobile, a polo shirt with oily rag logo. (theautomobile.co.uk)
The Automobile's fifth annual Oily Rag Run took place on 27th September and was hosted by the kind folks at Bicester Heritage. (theautomobile.co.uk)
There were plenty of Oily Rag exhibits this year in the single gigantic pavilion that now houses this unmissable annual jamboree. (theautomobile.co.uk)