Gong xi fa cai is how Mandarin-speakers wish you a happy new year—literally "wishing you to be prosperous in the coming year." Many overseas Chinese communities speak Cantonese. Gung hay fat choy is how Cantonese speakers wish you a happy new year—literally "wishing you great happiness and prosperity."

Is it okay to say Gung Hay Fat Choy?

Mandarin speakers who wish their friends and loved ones a Happy New Year, or Hsin Nien Hui (“Wish you well in the New Year”), are less inclined to greet others with Kung Hei Fat Choy. ... However, Kung Hei Fat Choy is simply outdated.

How do you respond to Kung Hei Fat Choi?

When someone greets you "Gong Xi Fa Cai" or "Gong Hey Fat Choy," a fun way to respond is with "Hong Bao Na Lai" which means "Red envelope please."