similar to (what the hell or what the hell is going on)

It is similar to "what are you doing," but it is often used among close friends/buddies. Probably it is not something want to say it to your teachers, parents, and bosses under most circumstances.

what are u doing ？ 的 意思 搞什么东东/东西/鬼 ？ 东东=东西= things 搞什么鬼？有一点疑问 是不是你在做坏事

类似于What the heck的意思