one who loses their virginity or is content having sex in the backseat of a car.
"I can't believe that backseat banger managed to do it in a mini cooper.. he's 6'4!"
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A backseat banger is someone who was invited to a threesome but doesnt do anything but sit in a corner to tell the other guy what to do, similar to a backseat driver.
Girl: should we invite Jeff to our house for a threesome?
Guy: no, I've heard that he is such a "backseat banger" ong