别闹我哥可是小霸王
[bié nào wŏ gē kĕ shì xiăo bà wáng]
'Don't mess around, my brother is Little Tyrant.' Here, 'Little Tyrant' is often associated with a domineering character but in a playful way, so it might reflect humorously on having an overpoweringly mischievous sibling or personality.