cherries and blueberries
n.pl.— «“What is cherries and blueberries?” “it refers to the red and blue lights (cherries=red, blueberries=blue).”» —“Slang name you can’t stand?” by bdunndchi in Indiana Police Forums & Law Enforcement Forums @ Officer.com July 14, 2007. (source: Double-Tongued Dictionary)
Further reading
A magnificent new book celebrates the richness and diversity of 450 years of written and spoken English in what is now the United States. It’s called The People’s Tongue, and it’s a sumptuous collection of essays, letters, poems...
If someone tells you it’s flisky or flobby outside, do you need to take an umbrella? A new book about England’s soggy climate includes 188 terms for rainy weather. Americans have their own joking names for local weather, from June Gloom in Southern...