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- (slang, often derogatory, US politics) A movement in the United States of America that doubts or denies that the 44th President, Barack Obama, is a natural-born U.S. citizen, thus implying that he is ineligible to be President.
- 2013, John Heilemann & Mark Halperin, Double Down, →ISBN, page 12:
- But Obama's plunge into the fever swamp of birtherism was just the latest detour on what had already been a long, strange trip—with many miles still to go.
movement in the United States