Top Definition
A girl who only enters thru a rear un-noticed entry of your house to have sex with you on the down low......a girl you only have sex with and keep it a secret.....enters thru your rear sliding glass door, comes to bedroom, has sex and leaves....
Back door girl came by last nite, had sex and she was gone.

You talking about jennifer, back door girl ?

Shes a back door girl, sneaks in , gets jiggy and sneaks back out !!!
by Heyman3000 February 12, 2010

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