Cyber Knight 

A noble individual who combats trolls, spammers, hackers, scammers, etc. on the internet

Oh man, i was trying to troll an internet chat-room last night, but some Cyber Knight kept slaying me with witty comebacks and good vocabulary.

Cyber Knight by xxzyf September 16, 2012

Knight in cyber armor 

That one person you know on Facebook. Typically a guy who will comment on a hot girl's Facebook status writing an essay long defense against someone who may have said something offensive. This is only a means to get the attention of the hot girl when in reality that person is just some loser behind a computer with no social life.

Girl status: "OMG, totally had a bad day. Nothing is right :("

Random person: "You always complain. Go kill yourself"

Knight in cyber armor: "This is uncalled for! It's hurtful and rude. I apologize if I hurt your feelings, but I'm not going to tolerate anyone being attacked with something like this. You're posting personal jokes on a public forum, you can't expect everyone to sit silently. If someone were attacking you, and it they meant what they said, wouldn't you want someone to step in? I would. So I did."

You (in your head): "Oh here we go. Another knight in cyber armor trying to save the day . News flash: At most, you'll get a "like" from your mom and will still be a virgin behind a computer."

Knight in cyber armor by Spearmints January 1, 2012