RhymeZone: flatlander definitions

Definitions of flatlander:

noun: (Western US, especially in the Rocky Mountains) Anyone from the East; anyone from outside the Rockies.
noun: (Appalachia) Any outsider to Appalachia.
noun: (northern New England) Any non-native, but particularly one from southern New England (including Massachusetts), downstate New York, or New Jersey.
noun: (Upper Peninsula of Michigan) Anyone from Wisconsin.
noun: (Northern Michigan) Anyone from lower Michigan (those below Mt. Pleasant).
noun: (lower Michigan) Anyone from Indiana or Ohio.
noun: (Wisconsin) Anyone from Illinois.
noun: (Canada) Anyone from Saskatchewan.
noun: (Georgia) Anyone from Florida.
noun: (Central Coast NSW) Anyone from Umina.
noun: (physics) An inhabitant of or observer in a universe with two spatial dimensions.
noun: (cycling) A flatland BMX rider.

(Definitions from Wiktionary)