What does "Bubble Gum Machine" mean?

If you hear a truck driver say "Bubble Gum Machine" on their CB radio, it's just another way to say "Light on top of police car." This phrase refers to the vintage single, rotating mirror lights on police cars that looked like round gumball machines. There are hundreds of other popular CB slang phrases - to learn more, check out the links below or browse the rest of our online CB slang dictionary.