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1.
The most lowering responce to any kind of an abuse. Often accompanied by the word "bitch" to increase its effect, as in: "You think you're better than me, bitch?!". Add an outraged look for maximum effect.
This retorical question is asked without expecting to recieve an answer.
However, if the person it is said to has enough guts to say: "Yes, I do!", you can say: "I am smarter than you, stronger than you, and more handsome than you, so shut the fuck up!".

Tip: Never use the expression when you do not really mean it. Remember that it can harm and insult a person more than many other remarks.
Used in the Shakespearen play "Romeo and Juliet":
Montague: So you say you are better than me?
Capulet: In fact, I do.
Montague: You lie!

-Hahaha, you will never achive anything, you loser!
-You think you're better than me?!!
- ...
by Urban_Fellow June 25, 2006