我姓杜却赌不出结局
[wŏ xìng dù què dŭ bù chū jié jú]
Means 'my surname is Du but I can't bet on how it ends.' Du has the same pronunciation as 'du' meaning gambling or guessing in Chinese. The nickname carries a poetic expression for fate - no matter how you try to guess or foresee the outcome of a certain event or life situation, things end up going differently than expected.