Here is the breakdown of the phrase:
* ته (ta): This is the word for "you."
* ښه (shpa): This word means "good."
* نه (na): This is the word for "not."
* يي (ye): This is a suffix that is added to the end of the word to make it an adjective.
So, the phrase "ته ښه نه يي" literally means "you are not good." This is the way that Pashto speakers say "you are mad."