The placement of two police automobiles in opposite directions such that the front driver's side windows of each automobie is adjacent to the other, thus facilitating conversation between the drivers.
From 50, slang for police + 69 the sexual position allowing mutual oral sex, in which two bodies lay in opposite directions.
Passenger: "Slow down, man, there are cops up ahead."
Driver: "Relax, they're not setting up a speed trap. They're just talking. See? They're in a 5069."