A Car Seat Bitch, is a girl with the body curves like the top half of a car seat, when you’re sitting in the back seat looking forward at it.
Guy: “Damn girl you a car seat bitch”
Girl: “what does that mean?”
Guy: “you got a skinny waist and big hips”
Bro: damn Bruh look at that girls fat ass with those big hips and skinny waist
Bruh: damn bro she a car seat bitch no cap