To do the impossible, usually derogatory in connotation.
Originates from historical context: George W. Bush gained political power through illegal manipulation of the voting system, passed numerous laws under false descriptions (ie "Clear Skies Act", "Healthy Forrest Act", "The Patriot Act"), Plunged an economically healthy country into a deep recession, cut taxes for the rich, destroyed the hope of national health care and social security, starved public education, instigated a foreign policy of pre-emptive attack without proof or any international approval necessary, ignored the kyoto agreement and nuclear non-proliferation treaties, began reproduction of nuclear arms, covered up global warming sections in the EPA annual report, and destroyed all faith I once had in our country being a progressive and positve example for the future. Now I'm just plain embarassed.
He fell off of a Segway. Dubya!