Top Definition
The role self-assigned by/to the person in the passenger or back seat of a car who insists on giving unwanted and endless streams of useless directions, much to the annoyance of the driver.
"Look, I'm driving this car. I know where I'm going and yes, I can see that stop light. I don't need a Naginator."
by Muz_in_MB January 18, 2014

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