Extra Heresy
Extra Heresy, also known as Double Heresy, is a form of Heresy so Heretical that it causes everyone in the room to drop everything and stare in awe of how Heretical it is. The term was coined by Commissar Fuklaw.
Extra Heresy is punishable by death DOUBLE DEATH Snoo-Snoo with an Ogryn Wracking.
...Followed by death.
This is NOT a stub, that's all there is to know.