Parents In Radar Above The Ear... It means a parent is watching the computer/ cell phone screen and to watch what you say. Don't say something that might be offensive to the person's parents.
Chris: OMG did you see the shirt Kristen had on today? Oh wow i felt myself getting hard....
Bob: Yeah that was hot
Chris: And then Billy slid into home plate that was awesome!
Bob: Yeah the score was 50 to 14!
Bob: ok she's gone
Chris: ok. i can't even say the things i want to do to Kristen out loud!