Live off the fat of the land
Definition 1 of 1
Pro Tip 1/3Wealth Dependence
Implies relying on external wealth or provisions, not personal effort. 
He had no job, but was living off the fat of the land through his inheritance.
Pro Tip 2/3Not Literally
Not about actual 'fat' or 'land' but about enjoying abundant resources or wealth. 
They moved to a richer country to live off the fat of the land.
Pro Tip 3/3Potential Negativity
Can be seen negatively, as living off others without contributing. 
Critics say that he's just living off the fat of the land and not earning his keep.