back seat baby
Term meaning WHORE when there are seven year olds in the room.
"You don't want your identity to be the biggest back seat baby in the school."
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.