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1.
A moment or short event where you wish you had a video camera with you. The video equivalent of a kodak moment.
It was a perfect youtube moment when Chris tripped and fell down a whole flight of stairs.
by Eric Moller February 06, 2008
 
2.
Random time when you are by yourself or with friends and are doing silly antics which really should've been recorded. Usually pointless but funny.
Bill: Man, we acted like total dumbasses before!
Josh: Yeah! That was a total youtube moment right there!
by J.mitch May 05, 2008
 
3.
An action or event that warrants being shared with millions of people... A modern day version of a "Kodak Moment"...
Paul: I walked in on my brother wearing nothing but a towel singing a justin bieber song...

Mike: did you record it?

Paul: Yep. He never seen me...

Mike: its a YouTube Moment
by Wolfgang239 September 23, 2011
 
4.
The moment preceeding an event that, recorded or not, would end up on youtube and serve as a hilarious warning to others, likely to cause severe injury and/or humiliation to ones self and/or others.
Right before attempting to ride my bike down a steep hill to break the world land speed record on a bike. I remembered seeing the last brutal attempt on youtube, and realized I myself was in a youtube moment and opted instead to ride to the bar, saving myself from the potential severe injuries and humiliation seen round the world on youtube.
by justplainbob August 20, 2010