When a girls vagina is shown from behind when she bends over
A girl wearing a skirt and no panties bends over at a bar, and you see her back vagina.

OR

asking a friend, "Can you see my back vagina?" when you are walking up stairs.
by IKNOWEVERYTHINGABOUTJARGON January 28, 2010
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"Omg that chick has a huge ass"
"Yeah I wonder what she feeds her back vagina"
by Aeroo December 16, 2008
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"Omg that chick has a huge ass"
"Yeah I wonder what she feeds her back vagina"
by Aeroo December 16, 2008
Get the Back Vagina mug.