毛爷说我是祖国一支花
[máo yé shuō wŏ shì zŭ guó yī zhī huā]
It's a playful nickname which refers to 'Lord Mao said I'm a flower of our motherland.' Here 'Mao' humorously refers to Chairman Mao Zedong and 'flower of the motherland' metaphorically indicates that oneself holds significant importance to the country.