to get in someone’s face, to act tough, to start an argument or fight
The complete saying is, "Do good and throw it into the sea, for even if the fish do not notice, God will." In Arabic you would say, ""E’mal ma’roof wermi fil-baHar." It means that one should do good deeds for their own sake, not keeping tabs or seeking credit.
tough; someone to be reckoned with; the one to beat