From Longman Dictionary of Contemporary Englishjust my luckjust my luckspokenUNLUCKY used to say that you are not surprised something bad has happened to you, because you are usually unlucky I didn’t get to the phone in time. Just my luck! → luck
Examples from the Corpus
just my luck• Just my luck! The one vacation I take all year, and I have to get sick.• Married, is he? Just my luck.• Great, I thought to myself, just my luck.• No chance, I thought, just my luck the clocks aren't working.• It was just my luck to have bags made of light nylon, weighing in at ten kilos in total. 