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1.
Having a residence on both coasts of the United States, specifically in the New York City and Los Angeles metro areas.
Me and thousands of other Americans are bicoastal.
by mahcheese August 27, 2008
 
2.
Having allegiance to or indecisiveness between the East and West coasts of the United States, particularly New York and Los Angeles.
He's so bicoastal he doesn't know whether to root for the Yankees or the Dodgers.
by Raymond Dang May 08, 2006
 
3.
Someone, often a bobo or a limousine liberal, who haunts both coasts and ignores what's in between; see red states.
He was so bicoastal he'd never heard of Omaha except in ads for mail-order steak.
by Cornholio October 30, 2003