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Someone so reliant on their car GPS system that they use it even though they know the route. Some people are so reliant they need their GPS to find their way out of their driveway. Those who become severely addicted may eventually lose their sense of direction entirely.
"My dad's such a GPS-tard that he uses it when he goes to the wallmart."

"Who's that GPS-tard holding up traffic?" ...HONK
by brawnylicious July 14, 2009