a fat lot of good
Something that is useless or not worth the effort. A fat lot of good that did me, spending all that time carefully wrapping the ceramic mugs only to drop the box on the floor and break them all.
a fat lot of use
No use or help. Used to describe something that is useless, unhelpful, or not worth the effort. A fat lot of use that did me, spending all that time carefully wrapping the ceramic mugs only to drop the box on the floor and break them all.