Why do you say "banana, you Bala" is a curse? What the hell does that mean?

Banana, you are guava. The allusion of this term should come from Sammo Hung's "Five-Star Red Flag" movies since 1983. This series of films can also be said to be the classics of funny films, which were replayed in Taiwan Province Province (but still very funny). One of the characters in the film is called Rhinoceros Skin (played by Feng Cuifan), who has a bad temper and likes to call names. Once he accepted the advice of a psychologist. Every time he wanted to swear, he changed the unpleasant words into fruits, so "Banana is your guava" appeared. Later, this sentence often appeared in Hong Kong films, Andy Lau 1988' s "Best Bad Friends" series, 1993' s Dongcheng Jiu, and many Stephen Chow films (it was said in the dubbed version of Taiwan Province Province, I wonder if the original Cantonese telephone call actually meant this). In fact, this sentence is mostly funny, and there is no meaning of swearing (you don't have to turn like this when you are really angry), but the above explanation is also very interesting. If you really say "banana, you guava" in an angry tone, it can only show that you really want to swear, but you can't think of any swearing words, or you are trying to suppress your emotions. Generally speaking, this sentence is actually similar to nonsense, and the meaning represented by tone is much more important than the content.