keyboard cowboy

noun3

1. •
   (Internet) a person who writes rude, angry comments online and acts brave only because a made-up name hides who they are
2. •
   (Internet) a hacker who breaks into other people's computer systems with no care for the law or for the damage done
3. •
   (Internet) A person who runs a .com company, or someone who was around during the dot-com bubble.