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1.
someone who sends every minute of there free time on youtube watchng videos or recording them sleves for hours then putting it on youtube or someone who watches the videos of the people who record themselves for hours
that new kid is a youtubian, thats all he does all day
by myscene September 24, 2006
 
2.
A Video that has originated on youtube
Sena, go check out that Youtubian Video
by ElormG July 10, 2008