Sksksksksksks is a saying for girls that think their cool.
In other words, annoying bitch syndrome. Some girls have it to be cool. But other have it but just to say it.
If you say this word and don't want to be a vsco girl. That is fine.
Something mentally restarted VSCO gurls do instead of laughing or being normal usually followed by saying and I oop which only ads to the level of sheer retardation basic white VSCO girls can radiate