Ego, What is Ego? Options

As a person, I have a big ego. I want to win at all costs. I want this and that. I simply want to have it my way. I want the cake and the icing too. I am spoiled and always want to take more than I give back. Is this an example of an Ego?

My ego boost me to gain riches, health, love and many other conquests.
My ego also make new enemies, destroy and corrupt various aspects of me and my environment consciously and subconsciously.

What is EGO? What does this word means?
How do you define it? How do you keep it your slave instead of it enslaving you?
(IMG:style_emoticons/default/sport_boxing.gif)

All this talk about killing the ego or not being dominated by it, could it not simply be put like this: Do what thou wilt.

In a sense, not doing what your true will "wants" you to, that would put the ego in the way, fear and all that, i may be way off tho since i havent really thought about it