because ricky and charlotte have only had sex once, in the back-seat of his car, and she is now pregnant, her child would be considered a back-seat baby
a baby conceived from having sex in a car, usually, but not limited to, the backseat
"because ricky and charlotte have only had sex once, in the back-seat of his car, and she is now pregnant, her child would be considered a back-seat baby" What is the definition of "back-seat baby"?