小弟弟 Traditional form: 小弟弟 Pinyin (reading): xiǎodìdi Definitions: little brother little boy (coll.) penis Characters: 小 - small, tiny, insignificant 弟 - young brother, junior 弟 - young brother, junior Traditional characters: 小 - small, tiny, insignificant 弟 - young brother, junior 弟 - young brother, junior