当某人在胡闹或装小丑的时候你就可以用 clowning around 来形容。

例句

Stop clowning around and put your coat on. We're going to be late!

I meant to do so much work today but ended up clowning around most of the day.

He was a terrible student - always clowning around in classes.

请注意

To fool someone 是另一个短语，意思是骗人，让人相信一件不真实的事。

Example: I used to fool the bar staff and get served beer when I was only 16.