南半球北半球你奶的大皮球
[nán bàn qiú bĕi bàn qiú nĭ năi de dà pí qiú]
This is a quirky and humorous phrase that doesn't make much literal sense. It can be interpreted as nonsensical fun with exaggerated expressions like “the large ball of dairy you made in both hemispheres”. It seems to express light-heartedness or whimsy.