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True/Old Anonymous (or Anonymous or Anon) refers to a personification of anonymous users on 4chan as a faceless green man in a suit.
Prior to V for Vendetta’s movie that was released 17 March 2006, Anonymous’ mascot was somewhat faceless. Exactly the thing Anonymous wanted to be portrayed as.
It was a green faced male, no eyes or mouth and sometimes a nose, Wearing a black suit with a red tie he would have “No Picture Available” printed on his face.
As a personification, Anonymous was created on 4chan sometime before 2006. An early appearance of Anonymous is in the flash movie Sageman , where Anonymous is shown fighting Sage man. Another flash movie also includes Anonymous, and was uploaded to Newgrounds on January 21 2006 .
The appearance of Anonymous is believed to have been inspired by The Son of Man, a painting by René Magritte.
The green color of Anonymous’ skin may have been based off the green apple covering most of the man’s face. 
René Magritte, The Son of Man, 1964, Restored by Shimon D. Yanowitz, 2009
Mainly used in arguments of how /b/ or Anonymous was better before Project: Chanology, here is afew examples of it in action.
The majority of use in /f/ would have to be “Party Hard” Flashes, where they take a flash that looks like this
And alter the music, the background, or even give him a hat.
Their is so much that their is a website coined to the Party Hard flashes, where the site lets you download over 300+ Party Hard flashes.
It was stated in the Comment section below that the dance might of originated, and most likely copied or flash “traced” from the guy dancing as 0:05 in this video
Another great flash example would be this “moot roll” where he plays the bartender.