you make a better door than a window.
: Often used by children, this is really a directive to tell someone to move out of the way because you cannot see what you are looking at.
= I cannot see through you, so move aside.
참조;
http://idioms.thefreedictionary.com/You+make+a+better+door+than+you+do+a+window
http://clichesite.com/content.asp?which=tip+1642
You make a better door than you do a window.
둘 다 되는 것이겠지요?
근데 전...혀 이해가 안가요ㅜㅜ