What does 53x mean in texting?

sex 53x is “sex” in leetspeak, a coded way to spell words developed on early internet messages boards in the 1980s. In leetspeak, letters are often replaced by numbers or symbols that resemble them—with the number 5 often standing in for letter s and 3, e, yielding 53x. 24-Apr-2019

https://www.dictionary.com/e/slang/53x/#:~:text=53x%20is%20%E2%80%9Csex%E2%80%9D%20in%20leetspeak,3%2C%20e%2C%20yielding%2053x.