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1.
One who makes a fool of oneself, either in a controlled recording or via a hidden camera, and is immortalized when said video is uploaded to and viewed on the internet.
"LOL, that guy is a complete and utter nettard!"
by Jacobbbbbb October 23, 2007
 
2.
Someone who is technologically challenged or retarded.
Joe's internet was not working because his ethernet cable wasn't plugged in to his laptop. What a nettard!
by Count Zackula November 02, 2005