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The act of taking advantage of someone generally when the person fully trusts you and TOTALLY doesn't believe that you'd actually take advantage of him/her. Generally full trust, passwords, account information, items on an account personal information, etc, are included but not necessarily all at once.
"Dude! I got Tgunn'd! All my plats are GONE off my account!"

"Oh, shit! Without asking, Tgunn sold my major war basinet w/ melee req that was given to me!"

"Dude, you got Tgunn'd!"

me - "Hey man, i borrowed your sings off your mule"
response - "dude don't be Tgunning me"
by Drouo August 24, 2004