叁人行必有奷凊
[sān rén xíng bì yŏu qiān qìng]
It seems to play on the Chinese idiom '叁人行必有我师' meaning 'when three people walk together, one of them must be my teacher.' The altered characters likely create a humorous or absurd phrase, possibly implying scandalous content in a playful way. It's not standard Chinese.