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3.
Someone devoid of talent who whores themselves out shamelessly looking for subscribers by posting way too many crappy videos on a regular basis.
Fred is a youtube hero.
by Miles the Magnificent September 18, 2010
 
1.
Youtube Hero is the nickname given to a player in a video game who insists on trying to kill the enemy in style and/or over-elaborate ways time and time again when simpler more effective ways exist. He/she constantly costs his/her team victory by continually trying to show off his/her skill in a manner that makes it look like they are trying to get some clips together for a Youtube montage.
In Gears of War

Jim: I killed three of the guys on their team and the last one came up behind me and got me, where the fuck was John?

Mike: He was way in the back with the sniper trying to blind fire a headshot.

Frank: God damn I hate Youtube Heroes
by QQSS March 11, 2011
 
2.
Someone devoid of actual training or expertise on a given subject, but watches Youtube all day so that they may interject fake expertise. Often they will watch what you are working on, run inside to watch a Youtube video, and then come out and try to act like they know about the subject. This often leads to improper use of words of phrases they know nothing about to look "cool" and knowledgeable.

These types are easily distinguished from the true "professionals" because they lack full understanding of the subject, practice improper use of the subject matter, and often run back and forth to the computer, and sometimes even bring it with them to "watch" and work.

Be sure to protect yourself from Youtube Hero's because they will likely mess up whatever they are working on and you will be caught holding the bill. They can be found in many areas but tend to favor Electronics, Computers, Car Audio, and Automotive Repair.
Nick was busy trying to get his stereo wired up yesterday when his room-mate came out trying to be a Youtube Hero. He heard us debating over which way would sound best and came out there and began talking out of his ass. We called him out and made him feel like a real dumb-ass. It's a good thing Nick didn't listen to him, because his amp would be toast right now.
by Hackowell May 21, 2014
 
4.
Playing along to Guitar Hero songs with the Guitar Hero controller using Youtube videos.
I'm so bored. I'm gonna go play some Youtube Hero.
by pjppjp September 18, 2008