1. A pleasurable sexual experience. Good sex.
2. A person who excels in sex, and being sexual with them promise a good time to be had by all.
We had such a good lay last night, I turned over and slept like a baby for 13 hours.
Just by the way she walks I can tell you she's a good lay.
to become a good lay, a slut must not waste time.
Do you see the slut bitching with that old mutt?, she is a good lay.