1.To brilliantly inform someone of a harsh truth that they were either ignorant of or tried with everything they have to ignore. The resulting truth leaves the liar impotent. Powerless. Usually a truth about themselves. Like Euthenize. But with the truth.
2. To call somone out on a huge lie.
1. Man, the Scooter Libby indictment and the lack of WMD in Iraq fully truthenized Rumsfeld and Cheney.
2. Dude, at the end of A Few Good Men, Jack Nicholson gets truthenized.