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1.
Similar in meaning to DNFTT (Do Not Feed The Trolls). This is a word used in chat forums and discussion boards. It means "Do Not Encourage The Idiot." When an idiot is contributing to a long and rambling thread and is JUST NOT GETTING IT, this is a code to just...shut down and quit responding!
"It's a lost cause. DNETI."

"He has no clue how it works. DNETI."
by Craigslist Helpdesk April 13, 2008