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1.
Someone who abuses/annoys/threatens/flames other people on the internet knowing that they will never have to fear retribution thanks to their anonymity.
"SHUT THE FUCK UP FAG! I'M GOING TO COME TO YOUR HOUSE AND KILL YOU AND YOUR FAMILY I SWEAR YOU WILL REGRET CROSSING ME!!!11!1!!"

"Whatever, keyboard hero..."
by redFST July 27, 2008