From VRChat. A recent (2017-18) bowdlerization of the Japanese word Suteki. The expression is used almost exclusively by the loli army, and in response to loli's. The phrase should be articulated in a highly excited and twee fashion.
It literally means 'oh how lovely!' or 'wonderful!'
The phrase probably became popular after Netflix started screening the anime Kill la Kill, due to it's usage therein.
While your girl is sleeping, jizz all over her tits. Then lay the top sheet on it. In the morning when it's dried up it peels off her like a sticky band-aid! Just as SEK did back in Naim.
Scott was mad his girl didn't want sex, so he beat off in her and gave her a stickyband-aid