中文有键盘侠，英文有 Keyboard Commando

Someone who acts tough behind a keyboard online, but can't say the same things in real life.
Keyboard Commando: 'That's complete shit! You're wrong! If I saw you in the street, I'd bash you!'

Real Life: 'Oh ... Hello ... Of course you are right and I am wrong. Sorry ... I won't disagree with you.'

http://www.urbandictionary.com/define.php?term=Keyboard%20Commando

想起杠神战猛男了，233333