A word coined by the great Stephen Colbert around the first of June in 2010. Jägertainting is the act of (I assume) introducing Jägermeister to your digestive system via the anus in order to achieve an altered state.
Jägermeister is an alcoholic beverage that was made popular by comedian Dave Attell...
"Did you hear why the Daily Show was a rerun tonight?
I heard the ol JS went Jägertainting and the bottle broke. He's gonna be out for a couple of weeks..."