n. modifier of cowchair. cowchair is girl you would bone if she ripped off her clothes and begged for it,whereas cowchair in the car is a girl that you would bone very happily under any circumstance, eg. hot. Used to relay this information to your friends while said girl is within earshot.
Guy 1: "Cowchair in the car!"
Guy 2: "Cowchair in the car? I dunno, cowchair, but in the car?"
Guy 1: "Dude, cowchair in the car."
Guy 2: "Yeah in the car..."