网友把这个词组理解了，意思就懂了：

make a fool of sb.  使某人出丑；让人看笑话；戏弄某人

形容词 complete 说明 fool 的程度，意为“完全的，十足的”。

oneself 反身代词表示“主语对自己”。

例句：

Don't have any more to do with him, he's trying to make a fool of you.

别再理他了，他正在捉弄你呢。

《汉英大词典》

If you wish to make a fool of yourself, that is your affair 

如果你想让自己出丑，那是你自己的事。

《柯林斯高阶英汉双解学习词典》

Who does she think she is? Trying to make a fool of me like that 

她以为她是谁啊？竟敢那样取笑我。

《柯林斯高阶英汉双解学习词典》

If you pretend to know what you don't know, you'll only make a fool of yourself. 

不懂装懂就会闹笑话。

《汉英大词典》

You make a fool of yourself and others laugh at you. 

你丢脸，人家瞧乐子。