2. The opposite of a bad ass; a non-violet, level-headed young person.
3. A particularly fine bottom.
2. "Look at that guy, studying when he could be could be doing semi-illegal things! Pah, what a good ass!"
3. "You see that girl? I think she has a really good ass!"
to clarify things
What man did you lose?
No man it was good i won...(Here would be a perfect situation to use good ass)