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The act of removing one side of your ear/headphones, so that you may hear the sounds of your computer, whilst remaining aware of the sounds around you.

Radar Mode is often initiated when viewing pornography in a house that is not empty of other occupants.
Adam: It must be annoying having your parents staying over this weekend.

Connor: Yeah, I've had to use Radar Mode all weekend!
by Belzario July 20, 2011