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
Social media has brought us a new kind of "hero".

That's a person that who scared to death of others when in person, yet feels free to insult you most creatively online. That's the lowest form of cowardice.

It's like those people pulling FU signs in their car, knowing you can't catch them as you're turning the other direction or when they see a huge guy coming out his car, hit full throttle or pass out out of fear.

If you can't say it to someone's face, DON'T say it elsewhere, if you have one atom of self-pride in your body!
The Keyboard Hero swore and called the boxer a wimp in an online comment.
by Awingman October 19, 2022