Flying Under the Radar 

History of the phrase; Prior to electronic counter measures, military aircraft would fly beneath the Radio Detection and Ranging (RADAR) in order not to be detected by enemy forces. This term started out as a military phrase in the 1950's.

Pop-Culture definition; generally an insult or can be used as advice.
1. To not stand-out, to remain quite.
2. To not drawn any attention to yourself either positively or negatively.
By not standing out or gaining any positive or negative attention, the person 'flying under the radar'
3. To go undetected.

Michael has never gotten in any trouble nor ever receive any special recognition, in fact he is disliked by his peers, hated by his subordinates; managers/supervisors have only disdain for him because he spent his 20 year career flying under the radar.

John "Dude, They will soon be on to you!"
Eric "What should I do!?"
John "All you need to do is Fly under the radar for the next two weeks"
Eric "Thanks, I will do.."

Flying Under the Radar by Anon-in-il-again October 7, 2008