Plattsvegas Share definition Flag The small, upstate New York city of Plattsburgh. Known for it's cold winters, the SUNY college, and heavy, heavy drinkers. "Yo man, I'm heading up to Plattsvegas for the weekend, I'm sure by Sunday I'll be dead". Plattsvegas by plattsvegian February 15, 2010 Get the Plattsvegas mug.