fanny fallout

When an extremely slender woman has legs that do not touch at the thighs when she walks or stands naturally. As her legs don't touch, you can clearly see the shape of her vagina between said thighs, the outline revealed for all to see. Considered desirable amongst women.

Girl #1: Eww! I can see the shape of her fanny because she's so skinny!
Girl #2: Are you kidding? I wish I had fanny fallout.
Dude: Damn, that's fine!

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