DK
n.— «Of course there are the other 10 percent of passengers, what he calls the “frumps, humbugs, and nasties,” as well as the DKs (the police radio code for drunks, which Clements refers to as “the entertainment”).» —“Life down under” by Billy Baker Boston Globe Feb. 22, 2009. (source: Double-Tongued Dictionary)
Further reading
A firefighter named Steve in Newport News, Virginia, wonders why in his line of work, and for some police, certain additional kinds of days off after long unbroken shifts are called Kelly days, Kelly shifts, or Kelly time. The term most likely comes...
A man from Fort Smith, Arkansas, says his Canadian wife is baffled by his pronouncing the word cement as CEE-ment. Stressing the first syllable of such words as police, insurance, umbrella, and vehicle is an occasional feature of Southerners’ speech...