A now stereotypical, thereby ad-hominem label for an individual who is sceptical about world events. Such scepticism largely emanated from the events of 9/11.
Some individuals embrace the term while others see it as a convenient label to paint all with the same brush.
Pro: I'm a truther, I look at the empirical evidence that wasn't in the official 9/11 commission report.
Noun- One who rejects the accepted explanation of the events of 9/11. Truthers generally believe the U.S. government committed the acts of terrorism against itself.