The story
Named after baseball players Thurman Munson (of the New York Yankees) and Trot Nixon (of the Boston Red Sox), by analogy with Mason-Dixon Line, coined in 2003 by Steve Rushin in Sports Illustrated.
Etymology from Wiktionary, CC BY-SA 4.0.
Munson-Nixon Line
Today it means: A hypothetical boundary line between sports fandoms in Connecticut, supporting Boston-based teams to the east and New York City-based teams to the west; the exact boundaries are undefined. Full definition →