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)
Further reading
In 1968, students at Cheyenne High School in Cheyenne, Wyoming, compiled a collection of their own slang, including the word Clyde, used to refer to one’s head, as in Use your Clyde! This is part of a complete episode.
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