嘻嘻笑笑 [－－－－]

Jyutping hei1 hei1 siu3 siu3
Pinyin xī xī xiào xiào

Definitions (Wiktionary)
  1. adj, literary
    happy; cheerful; gleeful
  2. intj
    hee-hee; haha
    (syn.) 嘻嘻哈哈