sikko is used in Turkish to refer to works of poor quality or absurd, stupid issues. For instance, people say: "sikko sikko işler" when they experience some absurd or stupid problems. It literally means "of poor quality". It is also used for people with a similar meaning to dickhead. It also has other usages but these two are the most common ones.
Ultra Instinct Sicko Mode is the highest level of sicko mode that can currently be achieved. It is where a person ascends to the highest level of existence. This results in the sudden absolute peak of physical and intellectual prowess where a person can act purely on instinct. As such, this mode is another way of saying that they are immortal.
"Holy fucking shit!! Daniel... he's going Ultra Instinct Sicko Mode! There's no way we can possibly defeat him now!!"
Sicko mode is a level of both intelligence and physical being in such one can achieve anything. This could be as simple as walking or as complex as explaining tier memes
Often used in comments about a person or thing, “Brian go Sicko Mode”