Getting yourself or others into a situation that is way over your head and spirals out of control.
Origin 1: President George W. Bush's Presidency
Origin 2: Michael D. Brown, FEMA Director / Bush's appointment
Origin 3: President Bush's nomination of Harriet Miers to the United States Supreme Court
We told some guy that our software could do all that and then when he invited us to a meeting, it turned out the president of his company was there expecting a demo and we totally got bushed.
I lied on my resume years ago by saying that I fluent in Spanish and then forgot about it until my first day at my new job and I totally got bushed when it turned out I was supposed to be the liaison to the Latin American office.