وقتی در انجام کاری خوب نیست یا به بدترین شکل ممکن انجامش میده ( مزخرف ) این اصطلاح استفاده میشه. If you think that someone is not very good at something, you can say that they are rubbish at it. He was rubbish at his job+ عکس و لینک
