oops paint
n.— «Hirschfield’s paint store donated what is called in the trade “oops” paint—paint that customers brought back or was improperly mixed or is substandard.» —“Gang scrawls fade as mural grows” by Rubén Rosario Pioneer Press (Minneapolis-St. Paul, Minnesota) July 18, 2007. (source: Double-Tongued Dictionary)
Further reading
Twice a day the River Thames recedes, revealing a muddy shoreline. Hobbyists known as mudlarks stroll the surface searching for objects that have found their way into the river over the centuries, everything from ancient Roman jewelry to modern...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a beach with a long stretch of...