Oči is eyes, oko is eye. As you see, Serbian has very unusual grammar...
"Volim Partizan, crno bele boje, volim Partizan, kao oči svoje" are the words from the FK Partizan anthem. It literally means "I love Partizan, of black and white color, I love Partizan, like my own eyes". Or more literally:
"Love Partizan, black white color, love Partizan, like eyes mine!"