How do you shame people that have no shame?

Correctly, it is 'Chain, Chain, Chain. Chain of Fools!'

cause guys like to look cool and say what they want. its their way of telling the world, Hey were awesome cause we dont giv a dam

Then it would be very easy not to get shameful because you would not have anything to give you shame in the first place. So, if you do not feel shame from anything but shame, you would not feel shame...

george bush

It means to be ashamed, specifically: you know how when you're ashamed you're kind of embarrassed to look anyone in the eye, so you look at the ground? That's what the phrase is talking about.