From Longman Dictionary of Contemporary English(a) fat lot of good/use(a) fat lot of good/usespokenHELP not at all useful or helpful Fat lot of use you are in the kitchen. → fat
Examples from the Corpus
(a) fat lot of good/use• A fat lot of good it did me!• Getting the pound down was what Labour governments did with metronomic regularity. Fat lot of good it did them.• Frederick Bissett was a member of the Institute of Professional Scientists, and a fat lot of good that did him. 