Niu Huanxi, a modern word that appears in Cantonese colloquialisms and a term that also appears in RTHK movies, refers to the genitals of a cow. Beef Cheerful is a dish that uses the female cow's pubic area (also pronounced 'cow's pussy' "hi" in Cantonese) to stir-fry with the ingredients. Representative dishes, such as Beef Cheer with Popping Sauce, are very popular among diners.

The name of the dish, "Cow Joy", seems to be so elegant that people are confused, but after knowing the truth, they feel that it is really a capital dirty. It is said to be because the bull will see a special favorite ...... but the cow rejoicing is said to be familiar because of the movie "Low Comedy", the movie line "I killed how many cows to give you fried a cow rejoicing ah!" It's very impressive.

Expanded information:

In fact, the cow rejoicing in the vast area is very popular, the Guangdong people have always liked to eat some people feel incredible things, so in Guangdong mentioned the cow rejoicing no one will be fussed.

In fact, some people are mindful of, in fact, it is understood that the cow cheerfully after processing and other meats do not have much difference, and meat than the general meat but also refreshing, a lot of people do not understand that there are so many things to eat, why do some people like to eat this, according to folklore, the cow cheerfully has a form of shape to make up for the efficacy of the yin yin to tonify the kidneys, with the bullwhip cattle treasure compared to the functionality of the more powerful.

Baidu Encyclopedia - Niu Huanxi