你喜成熟而我姓肖
[nĭ xĭ chéng shú ér wŏ xìng xiào]
'You like maturity and I happen to be surnamed Xiao'. This username creates a playful wordplay where it could mean 'Xiao (surname) coincides with someone being mature', the character 'xiao(笑)' in Chinese also means 'laughing or joyful' which may imply one is happy and enjoys life with maturity.