A church hopper is someone who chooses not to settle at any particular church. They would rather avoid commitment and hop from church to church to suit their yearnings while putting their emotions first.
Here are two articles that explain why church hopping is not such a good idea for Christians.
Commit your way to the Lord; trust in him and he will do this: He will make your righteous reward shine like the dawn, your vindication like the noonday sun. – Psalm 37:5-6