an ego death implies an ego rebirth. it is simply the humbling of the person you thought you were, usually the wrong idea of yourself that you now understand a lot better.
it is also one of the most important concepts in literature
don't be a faggot and deny it's existence or its importance in discovering oneself. it's basic jungian psychology, a simple transformation.
if you don't know enough to talk about it then shut the fuck up I think