I have some quesions about English expressions.?

Hello Mango, these are the answers to your question: 1) Miss fancy pants in the negative way is referring to the fact that that person is trying to impress somebody but is not doing it the right way. 2) 'you got someone whom you don't deserve' is basically saying that the other person is too much for you or that it is too good for you. I hope it helps.(-: