verb + 什么 +verb means "stoping doing something" or "why do you still do this" for example, you have to go to school at 8 o'clock. now it is 7:50 and you just begin to have your breakfast, then you mom could say: why do you still have your breakfast now?/ stop eating, you will be late, GO now! in chinese, we say, 你为什么还在吃早饭？/别吃了 有要迟到了，立刻出发！ but if your mom is a little bit angry, she will say: 吃什么吃！没时间了(no time)，立刻出发！ 吃什么吃 means : stop eating or why do you still eat now?

这句话的语境是什么呢？具体的意思需要语境的补充，我就先假设一个情景： 假如说，一个女孩走在路上和朋友开玩笑很开心，在路上跳了两步，结果无意碰到了心情不好的路人。路人瞪了女孩一眼，说“扭什么扭”。意思就是表示对于女孩行为的不满和责怪，这句话比较口语化而且包含贬义，但是本身并不含有太多意思，只是表明出一种不满的情绪，常见情景就和上文提到的类似，类似于说“搞什么啊”，“干嘛呀”。 如果情景不对的话再补充给我啊^_^