So先森So小姐
[so xiān sēn so xiăo jiĕ]
A creative play on words where '先森' (xian sen) is an Internet slang for 'teacher' and pronounced similarly to 'Mr.' in English, and '小姐' (xiao jie) is used here as 'Miss'. The So at both sides adds emphasis or exaggeration. The phrase overall gives a quirky and fun way to call someone Mister and Missis with an extra flavor.