狗屎 GǑUSHǏ - "Crap!" (other: "bullshit", literally "dog shit") #FireflyChinese
废话 (fèihuà) - "Nonsense!" #FireflyChinese
小妹妹 (xiăo mèimei) - "little sister" #FireflyChinese (check tags for more info)
妹妹 (mèimei) - "younger sister" #FireflyChinese (check tags for more info)