Such as: GG (brother), JS (profiteer), PFPF (admire), ZT (repost) and so on. These languages are usually used to extract the first letters of Chinese phrases, which are easier to understand and identify, so they can be widely adopted and spread.
Similarly, there are network terms abbreviated or changed from English phrases, such as GF (girlfriend) and PK (from the word "playerkill" in online games, meaning to challenge, kill and destroy the last one).
Development:
If we pay attention to and summarize what people often say when expressing anger in recent years, we will find a clear evolutionary route. That is, the "wow" introduced from Hong Kong and Taiwan at first (although it was mostly a surprise in China at first)-fuck-fuck-I fell (this literal form of civilization is used more now)-I fainted, I went-I laughed.
Why is the middle word accepted from the beginning to being abandoned later? This is a selection process in the process of language use. Those words that are not in line with the times and social development will eventually be abandoned in the long river of history. Only those words that are recognized by most people will have lasting vitality.
Baidu Encyclopedia-Network Terminology