The Gulf coast. Originally used to refer to the Texas coast and sometimes Texas in general, it now has expanded to generally mean the entire American region bordering the Gulf of Mexico.

While the term has been used for several decades in business names and catch phrases, the recent attention that Southern Hip Hop music has garnered has brought it into the limelight.
"The South is hip-hop's Third Coast, the final element making up the genre's worldwide holy trinity."
by JayJay Jackson April 22, 2006
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After a decades of east coast/west coast rap domination, third coast artists are becoming the hottest thing in hip-hop
by Nick Victim April 20, 2004
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Apellation describing the state and cultural region centered on Houston, Texas including Central and East Texas and Southern Louisiana used in several different contexts (film, hip hop and other music, left activism, etc).

This term is claimed by several other regions as well (Chicago, Western Michigan, the Southeast), but it properly refers to Texas.
Richard Linklater and Wes Anderson put the third coast on the indy film map.

Chopped and screwed, third coast style.
by dacoit April 28, 2006
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The gulf coast Alabama, Louisiana, Texas, Florida
Montgomery, New Orleans, Houston, and Miami are all on the third coast.
by jersey kid February 09, 2008
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The southern states that border the Gulf of Mexico (Florida, Alabama, Mississippi, Louisiana, and Texas.)

Can also mean the entire south, not only the gulf coast states.
by AC June 13, 2006
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Chicago, IL (aka the best city in the world because we have beaucoup freshwater.)
"Coast to coast, LA to Chicago." -Sade
"NYC = East Coast, LA = West Coast, Chi = Third Coast"
by HOOLY April 22, 2006
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Chicago

"Third coast" likely refers to the idea that the US population tends to be higher on the east and west costs, and that Chicago, lying on the shores of Lake Michigan, is the third largest city in the U.S.
The Third Coast Press is Chicago's Progressive News Source.

Nestled in the heart of Chicago's Gold Coast at the corner of Dearborn & Goethe is the Third Coast Cafe.

The Third Coast International Audio Festival was created by Chicago Public Radio.

Reason to boast on the 'Third Coast' by Michael Burnham - 3.29.06: The Windy City is home to the nation’s first skyscraper to achieve a Gold Core & Shell rating from the U.S. Green Building Council’s LEED (Leadership in Energy & Environmental Design) program.
by Geraldine April 22, 2006
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