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1.
A person who is addicted to the Internet or is always doing Internet-related things. This kind of people, mostly youths, are always thinking in terms of Internet memes or Internet words, the Internet has affected severely their lives. They sleep with a smartphone near their pillow.
I can't bear Francis' humor, he's such a netfreak.
by Wizard-Lizard January 10, 2014
 
2.
One who is a freak specificly online

One adicted to the internet
That guy is such a NetFreak
by NetFreak April 12, 2005