back-vag 

When a persons ass crack is showing above the waist of their pants creating a vagina like crack on their backside.

Mike "Dude, that girl in front of us in economics totally had a back-vag going on."
Al "I know man. It was so hot."
Mike "Dude! She was 300 pounds at least!"
Al "I know."

back-vag by Adam Woodard December 14, 2008

back vag 

The rear view of the vagina that is made available as a result of a skirt being too short.

John's new girl was such a skank that her back vag was showing at the restaurant.

Also: Dude, check out the back vag at eight o'clock.

back vag by lisanik March 4, 2009

Back Vagina

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.

Back Vagina by IKNOWEVERYTHINGABOUTJARGON January 29, 2010

back vaging 

when a friend secretly screws your "brother" behind your back.

I think Amy is back vaging me with John.
Trish tried back vaging me with Bill, too bad he had whiskey dick.

back vaging by Stacy Pacific June 11, 2006

Back Vagina

butt, ass, buttcrack, butthole

"Omg that chick has a huge ass"
"Yeah I wonder what she feeds her back vagina"

Back Vagina by Aeroo December 21, 2008

Back Vagina

butt, ass, buttcrack, butthole

"Omg that chick has a huge ass"
"Yeah I wonder what she feeds her back vagina"

Back Vagina by Aeroo December 21, 2008

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