1.This means she thinks you're an idiot and wonders why she's waisting her time standing here and arguing with you.
这意味着她觉得你就是个笨蛋,并且质疑自己为什么站在这里浪费时间地和你争吵。
2.The local thinning is called waisting or necking.
这种局部变薄现象叫做腰缩或颈缩。