Top Definition
The circular mark left on a car windshield by a standard GPS suction cup mount. This telltale mark is often left when a suction cup mount is removed after being left on for an extended period of time. Its presence alerts thieves that a GPS unit was used, and may be hidden in the car.
Will: Your car isn't the nicest one here, it doesn't even have power windows! Why do you think they broke into it?

Phil: They must have seen the GPS hickey and thought there was something worth stealing. Good thing I had the unit in my briefcase at the time.
by Will Gow July 22, 2012

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