2- to switch from MS windows to Linux, Mac OS, or another operating system. As in 'throwing' yourself away from Windows.
3- bluescreen of death. As in the user is thrown out of Windows.
2- I defenestrated to Mac OSX recently. Screw M$
3- My computer crashed and defenestrated me. Again.
Billy - "Dude, your a fucking retard. I'm going to show you what getting defenestrated really is."
It has been said that if you defenestrate an elderly woman, she will snap in two.