Slang for the shores of the Great Lakes, specifically Lake Michigan and more specifically Chicago; also known locally to Chicagoans as The Lakefront. The term Third Coast has its origins in Midwestern annoyance at East and West Coast attitudes (namely, the ones that forget there's an entire country out there in the heartland between sea coasts that doesn't need New York or L.A. in order to continue to exist).
1. Prominent Third Coast authors include mystery writer Sara Paretsky, lawyer turned novelist Scott Turow, and poet Marc Smith, originator of the infamous poetry slams at the Green Mill Lounge.
2. Dude, I'm headed down Lake Shore Drive for the Third Coast Festival. You coming?