It is something that has been studying in the music conservatory.
It is something that can be use as tool by composers.
You can replace it with "Something" when you think it might be "serialism". It works. Don't take a risk of being an idiot.
B: It is Serialism. Oh yeah, it sounds like Serialism.
C: No dude, it is Bach's Fugue in B minor.
A: What is that music ?!?!?!
B: It is something. Oh yeah, it sounds like something.
A: Oh yeah.
The result is a chaotic, soulless mess that sounds like two cats clawing eachother to death. Serialism requires little real talent since no matter how you do it, the result will always sound the pretty much the same. It is not unreasonable to speculate that serialism was invented by composers who had no real ability or skill and needed a way to cover that fact up. Serialism is a disgrace to classical music and makes even rap sound great in comparison.