细佬豆娘
[xì lăo dòu niáng]
It is a rather obscure phrase combining different parts from different sources. In Guangdong (Cantonese) dialect, 细佬 means younger brother; 豆娘 (doumiao) traditionally refers to dragonfly, but in some regions/dialects it's used for children’s playmates or a familiar title used by men referring to girls around them. So overall, this may refer to a playful interaction between kids or siblings.