A man who can blend in to any scene or situation without standing out , hiding his skills and qualities .
Someone working undercover .Look at him he looks like he"s worked here for years .ie a grey man .
by Wee Jake May 5, 2008
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The "Grey Man," you must become the grey man, you should act like the grey man.

This term describes the intentional act of dressing and behaving in an inconspicuous manner, in order to avoid any unwanted attention from strangers or authorities. The goal is to dress, walk, and behave as a local, without attracting any attention to yourself. To "blend in" in a foreign (usually hostile) enviroment. To be visible and yet invisible at the same time.

It is a term sometimes used by special forces or espionage operatives, in scenarios when an operative in the field must assume the disguise of an average, unremarkable local civilian. The goal is to use this disguise in order to travel unchecked through populated, urban areas whilst remaining undetected, and to avoid attracting any attention to himself or his real identity as a foreign agent.
"A pilot shot down behind enemy lines should act like the grey man: quickly don the garb of the locals, avoid eye contact, conversation, and children." (As they are more likely to point or shout when they see someone who is unusual or noteworthy.)

A wanted fugitive on the run from authorities would certainly want to become "the grey man" in order to avoid leaving a memorable impression on anyone who may recognize his face; they would be less likely to describe his appearance accurately if he is not particularly memorable.

"It was my first time in Moscow. I didn't speak the language very well and I didn't want to stand out as a foreigner, so I just decided to act like the grey man and blend in with the locals as best I could."
by The Polkovnik October 29, 2013
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A person who believes they can dress like the Maytag man and carry an assault rifle in a lawn chair bag through FEMA/LEO/UN check points undetected during a crisis event.
When the balloon went up i threw on my multi cam BDU's, grabbed my shoulder bag and shoved my M4 in the old lawn chair bag by the door, as the grey man, no one would ever suspect me of being well armed and fed!
by JRW0101 May 5, 2008
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The Grey Men have complete authority over all things. Even authority over the gods themselves. Grey men do not exist in just one realm/plane when one becomes a grey man they exist in all realms in all planes and in all of time from begining to end. What the grey men choose to do is done for their own good. The commander, of the Grey Men, has authority over the other grey men. The Commander appoints two generals who answer only to him, when the commander dies the generals are forced to fight each other, the winner becomes commander of the grey men, and the loser is forever trapped inside of his own mind to be eternally punished by having to feel all of the pain he has ever caused anyone and to feel all the pain that he has ever been through except that even the smallest amount of pain will make him wish that he could die but he will continue surviving and suffering. Once the commander makes someone a grey man they are written forever out of history, sometimes being written into fiction if they are lucky. Once a grey man dies he becomes nothing for he never existed other than when one of the generals loses the fight with the other general. except when the commander dies he is remembered.
King Aurthur and the Knights of the Round Table and Merlin eventually became grey men.

Atlantis exists in fiction because it was sunk by a grey man.
Avalon, Merlin's home was cast into fiction by Merlin becoming a grey man
by A General of the Grey men October 18, 2010
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