What Does It Mean To Be Born Again?

How many of us, if we were honest, could explain what it means to someone who doesn't know?  If a friend, co-worker, neighbor asked, "What does it mean to be born again?" How would you respond? When the phrase first left Jesus' mouth it was something yet completely unheard of; it was astounding to his listeners. So while we may have heard this phrase a hundred times, do we really understand what it means?