Foggy Bottom
noun
a low-lying area bordering the Potomac River in Washington, D.C.
Informal.
the U.S. Department of State, whose office building is located in this area.
Cultural definitions for foggy bottom
Foggy Bottom
A nickname for the United States Department of State, whose offices were built in a formerly swampy area of Washington, D.C., known as Foggy Bottom because of vapors rising from the swamp.