She let the goods slip while they were doing the nasty.

她们滚床单的时候她不小心说漏嘴了。

To do the nasty with your boyfriend.

跟你男朋友做见不得人的事。

They got to be doing the nasty by now, right?

他们肯定已经滚过床单了吧？

And now that we have Celia in afternoon preschool, all we have to do is unload Juanita, and then we can get back to doing the nasty.

现在每天下午都有未上学的西利娅要照顾，所以我们必须这样做才能摆脱胡安妮塔，这样才能回来好好做爱。