Somebody who is anti-truth. Somebody who derides, vilifies, berates or otherwise insults anyone who expresses the need to investigate the 9-11 terrorist attacks on the USA further, or who belittles anyone who believes the official version of the events are at least inadequate. Somebody who is unwilling to consider evidence which goes against the official version of the events of the terrorist attacks on America. The antonym of truther.
It is common for anti-truthers to label truthers as un-American.

The campaign for 9-11 truth came up against opposition from anti-truthers.
by ubermarklar October 23, 2011
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anyone who is intelligent enough to realize that the official government account of the 9/11 attacks are not supported by the physical evidence and want to know the real truth about what happened
Here are just a few facts that 9/11 truthers want explained:
In 1945 during a heavy fog a B-52 bomber accidently hit the Empire State building, sustaining minor damage but was repaired and is still standing today, because of this incident modern skyscrapers are specifically designed to withstand an impact from a jumbo jet.
In 1993 terrorists ignited a truck bomb beneath the twin towers after that incident the towers were regularly inspected with bomb sniffing dogs, these inspections stopped just months before 9/11 Marvin Bush was in charge of security at the World Trade Center.
In 1998 the Project for the new American Century or PNAC stated their goal of invading Iraq and overthrowing Saddam Hussein, but said they would need a "Pearl Harbor" to sell this idea to public, key PNAC members became part of the Bush Administration.
The towers did not collapse from the initial impact, many people were safely evacuated and the towers collapsed some time later. The government claims burning jet fuel softened the steel support beams causing the collapse. Jet fuel burns at a maximum temperature of 1500 degrees, the steel would have to reach 2000 degrees before it even began to soften, steel melts at 3000 degrees.
If the steel beams did get hot enough to soften, the towers should have tipped toward the point of impact, but instead the towers collapsed straight down like when explosives are used for a controlled demolision.
by Mr.Juan-derful May 30, 2010
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Someone who believes the debunked theory that General Pershing dipped bullets in pigs blood when fighting Muslim troops in the Philippines. Many right-wingers believe that if we took such action, all Middle East wars would end because Muslims would not go to heaven if shot with a bullet dipped in Pig's Blood.
My uncle is a crazy Pigs Blood Truther that also believes 911 was an inside job.
by AA6464 August 18, 2017
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Guy 1: Dud you see that dipshit that interrupted Malcom Smith?

Guy 2: Yeah another one on those 9/11 truthers.
Guy 1: When I'll they realize how stupid they sound
by Jesus Cosby March 28, 2016
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An individual who refuses to believe the corporate media and governments story that 19 hijackers in a cave in afghanistan flew several large commercial airplanes with no flight experience, some of which have reported to be alive by the same media. The mastermind behind this, osama bin laden pronounced dead 9 times before he was finally found in pakistan, then killed, with no trial or autopsy, and had his body dumped into the ocean. Much like any propaganda, false flag operations are always a way to start wars and create a false enemy.
9/11 Truther: "Did you know the government had planned 9/11 and several others took out insurance policies to cover their loss"
Statist: "More conspiracy theories. Now you are going to tell me america funds terror organizations"
Truther: "The truth must not be easy to fathom"
by Key2awesome September 27, 2017
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Popular line from the TV show, "Drake & Josh", where Josh calls Drake a liar.
Josh: Drake, you made that whole story up!
Drake: No?
Josh: YOU, started that fight!
Drake: You callin' me a liar?!
Josh: I ain't calling you a truther!
by uberSMACK September 12, 2014
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