Wiktionary
what's good
phr. 1 (context colloquial English) what is good, especially in reference to food. 2 (context slang English) what's up
Usage examples of "what's good".
Ye know very well it's devil another doctor will he tolerate, being an intelligent man that knows what's good for him.
Looks to me as if they've ripped out what's good and abandoned the rest.