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3.
The large number of people that comment on youtube videos who do at least one of the following: troll, lack proper grammar/spelling skills, post ridiculously stupid comments that prove they have a low iq, or ask people to give them a thumbs up...
Bill: That video was hilarious man. Did you read some of those comments also? Those were pretty good too....

Jim: No, I usually don't bother reading them because it is just a bunch of youtard nonsense.
by the dark seahorse April 20, 2011
 
1.
Someone who posts a meaningless video on YouTube.
I'm sending you a link to a 28 second clip I found on YouTube, posted by a YouTard, which has no apparent purpose other than to take up space.
by circushead December 21, 2006
 
2.
Name given to all the idiotic people who post comments on Youtube.
"Vile rage? Rampant racism? Huge neckbeard? Yep, we've got a Youtard on our hands. I wonder what the thinks about the Moon Landing..."
by DiseasedTempest November 28, 2007