嘻嘻 Traditional form: 嘻嘻 Pinyin (reading): xīxī Definitions: hee hee happy Characters: 嘻 - happy, giggling, laughing; an interjection 嘻 - happy, giggling, laughing; an interjection Traditional characters: 嘻 - happy, giggling, laughing; an interjection 嘻 - happy, giggling, laughing; an interjection