oil spot
v.— «If anyone leaves the bus to get something to eat while the driver is not around, they must leave their laminate on his seat. That way he knows to wait for them. Otherwise they will get “oil-spotted.”» —by Jeri Goldstein How to Be Your Own Booking Agent Feb., 2004. (source: Double-Tongued Dictionary)
Further reading
What exactly is a planet? Controversy over this question led to Pluto’s redefinition, along with a brand-new English word. And: Some people now use the phrase all the things! to mean and whatnot or you know what I mean. This new sense of all...
Eduarda phones from Rio de Janeiro, Brazil, to ask about the English expression burn the midnight oil, meaning “to work late.” The phrase goes back to the days of having to use oil lamps for illumination at night. A Spanish idiom...