party ball
n.— «Then a stop on a car with no front plate, the goods in the back-seat, the trooper asks the driver to remove them. “Let me go back and run your license.” Several cases, and what’s called a party-ball are pulled from the back-seat.» —“UHP Targets Illegal Alcohol, Fireworks Near Wyoming Border” by Marc Giauque KSL.com (Salt Lake City, Utah) June 13, 2006. (source: Double-Tongued Dictionary)