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A girl that enjoys anal sex, sometimes even over vaginal sex. This is usually a secret preference, and not advertised by the girl, to avoid jokes and to protect her "reputation" as a "nice" girl.
She'll never admit it, but I've heard that she's a Backdoor Betty!
by TheMaskedMarvel January 31, 2010
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"Do you know that girl?"
"Nah, but i wish i did, Beno used to go out with her and he reckons she's a Back Door Betty."
by bdbetty December 02, 2015
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