Top Definition
A conspiracy theorist willing to accept any negative claim about Barack Obama, up to and including that he was born on another planet and sent here by his parents (which would make him an illegal alien, and thus ineligible to be President of the United States).
Look at that guy waving a birth certificate in a bag. What an astrobirther.
by Nameless Cynic August 09, 2009
5 Words related to astrobirther

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