You're a real nitwit. Why should you badmouth his girlfriend in his face?
你真是个糊涂虫，怎么能当他的面讲他女朋友的坏话那？
16.饭量小 eat like a bird
She eats like a bird. A small piece of bread will be enough for her.
她的饭量特别小，吃一小块面包就够了。
