A person sitting in the backseat of a car who has no say in what goes on inside the car.
"Hey change it back, I like that song!"

"Shut up backseat charlie."
by buttcheeksbrown November 11, 2012
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A person sitting in the backseat of a car who has no disision in what goes on goes on inside the car.
"Hey change it back, I like that song."
"Shut up backseat charlie!"
by weeeeeeeeee July 2, 2005
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