ما معنى “كفيت ووفيت”؟

it is ""كفيت ووفيت" and it is said to the person who had given you some help (fully) or in a way that pleased you . literally the expression means " you had saved me the tiredness of doing the job كفيت = كفيتني and you had fulfill the task ! وفى= يفي = to fulfill with what you have promise someone...