1 definition by Guinness Book of World Records

1. The occurence when no other vehicles are around to see you run or roll through the stop sign.
2. Condition of a stop sign or light when one does not care what the other asshole motorists think when he or she has failed to stop.
passenger: You totally blew through that intersection without stopping. Aren't you worried you'll get caught?

driver: The sign was stoptional.
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