A synonym for cute or small. Usually used when someone is really happy or excited for something. Commonly used by asians, asian wannabes, or those insulting asians.
Goldstein: Oh hey Ana! Wow that shirt is really oksu on you!
Ana: ty ty ^.^
David: Hey Boris, check out that group of FOBS
over there! They look so oksu with their hello kitty dolls!
Boris: Hey that's my people you're making fun of :(