>>Can you explain to me what is meant by "what's good for the goose is good for the gander"?
>
>If something is good enough for one, it's good enough for all.
>
>Traditionally, btw, it's not "what's good," but "what's sauce," I think.
>

That's generally the way I've heard it, too.

I might quibble with your definition. To me it has a more specific, personal connotation. "You did it so now I can, too." Something like that.