He's on an ego trip, he's out of control!

他太自负了，他已经失控了！

If someone is said to be on an ego trip, they are only thinking of themselves.

如果说某人追求自我满足（on an ego trip）意思是他们只想到他们自己。

Half of them are self-centered busybodies on an ego trip and the other half only in it for what they can get out of it.

一半是想满足自大、自我为中心的好事者，另一半只是为了捞油水。