Here's a breakdown of the characters:
* 你 (nǐ): You
* 是 (shì): Are
* 外 (wài): Foreign
* 国 (guó): Country
* 人 (rén): Person
It's important to note that this phrase can sometimes be used in a slightly rude or offensive way, depending on the context and tone of voice. It's best to use it cautiously, especially with people you don't know well.
If you want to ask someone if they are a foreigner, a more polite way to do so would be to say:
* 您是哪里人？(Nín shì nǎlǐ rén?) - "Where are you from?"