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Netcat means someone whose purpose for being friends is to just shovel information. It can also mean someone who gossips, spreads rumours, makes up stories, or is just a general tool. Netcat is a word derived from a software tool that's only use is to shovel information.
"Hey Jon just told Sean everything I said!"
"Dude wasn't that a secret? What a netcat."

-or-

"Jane just started telling everyone I like nicole?!"
"Wow bro she is such a netcat."
by Dave Ya August 07, 2008
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