One who acts in a disturbing or gross manner. Usually referring to somebody who talks about sexual acts.
You want to sleep with your brother? Sikko!
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Guy who is very muscular and is know for having had sex with the mothers of many of his friends, especially those called jannes
Wow you are so handsome and cool, you almost look like Sikko!
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.
sikko sikko işlerle uğraşıyoruz.