Kussy is derived from word Kuss (Pashto and Farsi) which means cunt or pussy. Kussy in general means a bitch.
Guy 1: Man, your girlfriend is such a kussy, i used to date her.
Guy 2: Word?
Derived from the words Hussy and Cunt.
A very stupid and/or idiotic human being.
Marsha Brady is a kussy!