1. One who is incapable to use the internet.
2. One who is bad at using common, tools on the internet.
phil: I tried finding free porn, but I couldn't.
john: What? Dude, google any word and you get porn.
phil: What's google?
john: You're internetarded.
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Someone who is being a retard on the internet or just internet illiterate.
Some girl just posted a naked picture of herself on Facebook. How internetarded.