It is a Hokkien (Fujian dialect) term you will hear a lot during Chinese New Year. It goes with the Chinese obsession with prosperity and luck in the form of riches via a windfall. Chinese folks like to gamble, be it at home card games, on mahjong tables or at casinos. So "huat" is like a clarion call and a good luck greeting.
Chui Ker (Hokkien) or Woon Chai Koh (in Cantonese) is rice flour cake steamed in metal cups or bowls. The rice pudding is then topped up with 'Chai Por'.
The toppings of Chai Por is preserved and fried radish (lobak) chopped into bits with sesame oil and soy sauce added. Chili sauce is optional.
It is takeaway or street food that should be eaten on the wax paper it comes wrapped in.
The exact recipe varies. Some use shallots or turnip, some add dried shrimps (heh bi) while others soak the toppings in a special oil concoction.