slang Code for a state trooper or police officer used on citizens band (CB) radio, especially by long-haul truckers. Alludes to the style of hat that many state troopers wear, which is also worn by Smokey Bear, the character used to promote wildfire prevention. Anyone got their ears on? Just spotted a smokey off the junction to I-75 junction. A: "Watch out for smokey bears heading into Derby City." B: "10-4."