Top Definition
When either the driver of a motor vehicle or a passenger in that motor vehicle reaches to the row of seating located directly behind them to participate in sexual activities with another passenger.
Chris: Hey Blake! did you hear Ryan gave Sam the blazer pussy grazer in the back of your car while you were driving yesterday!?

Tyler: I know, Sam is such a whore!

Blake: Wow, no way! what a dirty cunt!
by John-Jacob Gingle-HeimerSchmit November 30, 2009
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