backseat betty 

used to describe a promiscuous girl who likes to have sex in the back of a car. This is a rather old expression

two girls are jealous of a popular girl so they start a rumor that shes a "backseat betty".

backseat betty by synthetik_smurf September 7, 2005

backseat betty 

Chick who gets down and dirty and rides bitch on bikes.

I got all up in that backseat betty i took out last week.

backseat betty by jawa23 December 20, 2007

back seat betty 

A female who frequently has sex on the first date or first encounter.

Britney: Hey Lohan, did you call that guy we met at the coffee house yesterday?
Lohan: Yes, we met for drinks and well sex this morning.
Britney (laughing): Sometimes you can be such a back seat betty.

Nicole: Paris, did that guy give you a ride home from the club last night?
Paris(smiling): Yes, you could say that he gave me a ride last night.
Nicole: Your family should have been in the automobile business, because you are such a back seat betty.

back seat betty by atisha v January 6, 2008

back- seat betty 

Someone who frequently has sex on the first date or first encounter.

Jan's friends refer to her as back- seat betty because of her many one night stands.

back- seat betty by mariy December 6, 2007