The sarcastic,combative,and apparently omnipotent self-appointed expert on any topic of discussion.
The keyboard cowboy has a unique knack for butting into civil,informative discussions and reducing them to good ol'fashioned internet flame wars.
The keyboard cowboy has singlehandedly taken nearly every 'net bulletin board down several IQ points.
Rocketrob40 is fast becoming known as a lame keyboard cowboy
by Rob bites August 24, 2008
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A person whose only reason to participate on an Internet discussion board is to argue and be combative, oftentimes joining just to add a pointless but hurtfull comment then to leave never to be heard from again until the topic nearly dies out and then jump back in to fan the flames. They seldom if ever add anything of substance to any discussion they participate in, but instead just troll various forums looking for a fight -- stirring the pot with no rhyme or reason.
Tread1 is the king of the keyboard cowboys.
by Treadsux December 20, 2008
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someone who talks cack on the internet and expects not to be caught especially privately and then exposed
x is a ****...(usually to another keyboard cowboy)
by one face March 23, 2009
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The ultimate code slinger. Wild, impulsive, living on the edge and taking risks without worrying about the consequences. May or may not singlehandedly take down a corrupt government to aid the public.

Derivative from the 1995 film hackers starring Angelina Jolie and Jonny Lee Miller.
"You wanted to know who I am zero cool? Well, let me explain the new world order. Governments and corporations need people like you and me. We are samurai, Keyboard Cowboys and all those other people out there who have no idea what's going on are the cattle. Moo."
by Kevin Mitnick 1 June 13, 2020
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If the internet was the old west, than the Keyboard Cowboy is it's, well. . . Cowboy.

Keyboard Cowboys are the people you see bring lawlessness to the Internet, Cowboys behind their computer screen on tapping away at the Keyboards. Picking on people, submitting crazy definitions to UD. The bulk of Keyboard Cowboys are manifested in 4chan like an old smelly saloon for them to meet and discuss their antics. They are trolls, post gore, and taunt the shit out of people.

Also hackers
And the people behind Encyclopedia Dramatica.

I support keyboard cowboys
Dave is a hacker, steals, breaks the law, and does it all of the Internet. Dave is a Keyboard Cowboy
by RolphSemensDickOvensUWIDI October 13, 2010
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A somewhat lame but funny term uses to define hackers. Made popular by the movie Hackers.
?f$Q (not a real person that I am aware of) is a real uber 31337 haZXoR.

by HybridStrom June 26, 2004
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Someone that goes FUCKING CrAzY behind a Twitter post or email or text but is totally harmless and rather sweet in real life.
The keyboard Cowboy walks in and says

“I need to see you immediately”. Walks into the room…. “Hi! How are things?!”
by silviasm September 3, 2022
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