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".
by synthetik_smurf August 15, 2005
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Chick who gets down and dirty and rides bitch on bikes.
I got all up in that backseat betty i took out last week.
by jawa23 November 20, 2007
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