Acting like George Bush, i.e., generally being an evil jerk. Coined by David Letterman (or his writers, anyway), May 5, 2009 episode.
Did you hear after frightening NYC by strafing Manhattan with Air Force One and a couple of fighter planes, the White House has decided not to release the photographs? I don't know. I think they're Bushin' it up a bit on that one.
by walterigo May 05, 2009