阿九阿九长长久久
[ā jiŭ ā jiŭ zhăng zhăng jiŭ jiŭ]
'Ah Jiu Ah Jiu' means long-lasting in this context, likely referring to wishing longevity and eternal stability, maybe to a relationship or just life itself. (note: '阿九' means 'A Jiu' while repeating makes emphasize).