Definition
To express anger or frustration about someone's foolish or inexplicable actions.
究竟在做什么（常帶怒意）
What were you playing at? You almost ruined the entire plan!
你到底在搞什么？你差点毁了整个计划！
I don't understand what they were playing at, canceling the meeting at the last minute.
我不明白他们在搞什么，在最后一刻取消了会议。
What is he playing at? He threw the important documents in the trash.
他在搞什么？他把重要文件扔进了垃圾桶。