Moran is a misspelling of the word "moron". The spelling gained Internet meme status when the photograph below was widely distributed via email. The phrase "Get a brain, morans!" has become a standard cliché in reference to people who haven't got a clue about what's going on.
See also the famous TT discussion topic: The morons who comprise the TT clique
The origin of the photo is not known for sure. There is suggestion that it was taken at a Boeing plant near St. Louis shortly after the second Gulf War began in March 2003. Others suggest the photo is merely a prank.