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The lower part of the back where it curves in most. Generally located above where most people wear their pants. It can be a very sensual spot to touch lightly as a form of flirting, or just to move past people.
Stacy: Justin touched the small of my back and I melted inside.

Kim: I want to get a tramp stamp on my small of the back!
by alexob April 06, 2014
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