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1.
The collective nickname for three characters in the X-Files, Melvin Frohike, Richard Ringo Langly and John Fitzgerald Byers. Three computer hacking geeks who publish the fictitious newsletter, called the "Lone Gunmen." Originally their newsletter was called "The Magic Bullet," but for some reason it was changed in the show. A positive term instead of 'conspiracy nut.' The Lone Gunmen were dissident heroes who fought government corruption and conspiracy. Soon, very soon, anyone who admits a liking of this television series will be arrested and tortured under the new law voted on by congress and the senate, where anyone who even speaks critically of any action of the government can be imprisoned, tortured and 'detained' forever without trial, evidence or charge. Welcome to the New World Order.

n. plural - Conspiracy nut, conspiracy freak, conspiracy theorist, conspiracy geek, conspiratologist.
That Alex Jones is like one of the Lone Gunmen, always talking about conspiracies.
by sternwise September 30, 2006
 
2.
The Lone Gunman is when a man jerks off in the corner while choking himself with his gun belt.
Did you hear Jake died last night?
No How?
He was pulling the lone gunman and did not withdraw fast enough!
by Sauski February 13, 2009