Top Definition
A person who sits in the backseat of someone's car and gives them directions where they should go though the driver already knows where to go and the person in the backseat opinions on where they should go doesn't matter.
Hey man let's go to Mcdonald's no wait let's go to Taco Bell...then my house

Shut up man stop backseat driving me I already know where I am going to go.
by Rustybeartrap April 28, 2011

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