small of the back

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!

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sized up

A way of saying a man got a boner, stiffy, erection, etc.

Sized up is a play on the phrase 'siezed up'.

Alexa: I came twice in a row thinking about last night

Jordan: Dayumm I just sized up hard

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