nothing upstairs

"Nobody is getting nothing upstairs - just a good time."

Poor thing, I told her, "Mom, if my butt was a little smaller you would have nothing upstairs."

Nothing upstairs but a loft-hay and so on.

"Take it from me, there's nothing upstairs except cooking," she said, breaking into a naughty giggle.

And nothing upstairs is the same.

"It comes with the genes," he told her, then added: "Of course a lot of them have nothing upstairs, so it all balances out."