A neurological disorder that is characterized by invoking the tragic events of September 11, 2001 in places where they don't belong.
The phrase was coined by Jon Stewart of The Daily Show on Octover 1, 2007.
Actual examples of 9/11 Tourette's:
"I also think there have been subsequent intervening events, September 11, which cast somewhat of a different light on the second ammendment."
"Won't you 9/11 help us 9/11? Because 9/11 is a terrible 9/11 to 9/11."