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1.
someone who is on YOUTUBE way to much then their supose to be; practically live in YOUTUBE.
Sam: get off the computer already! you've been on for days!
Mark: sorry, i just love YOUTUBE so much i practically live there!
Sam: So, i guess you would call your self a YOUTUBEIAN!?!?
Mark: I guess so!
by Kit Craige February 21, 2009
 
2.
A YouTubeian is some someone who posts Video's of themselves on Youtube.
He/She has been a real YouTubeian lately, and anything & everything they do is being posted onto Youtube.
by Neil from TheHippySeedCompany February 05, 2009