From Longman Dictionary of Contemporary Englishlucky you/me etclucky you/me etcspokenLUCKY used to say that someone is fortunate to be able to do something ‘My husband’s a rich man, and devoted to me.’ ‘Lucky you.’ → lucky
Examples from the Corpus
lucky you/me etc• You don't know how lucky you are in that respect.• If you lucky you can do alright.• If you are lucky you might get a codex thrown in for a good measure for telecomms application.• Here in the Adirondacks, if you were lucky you might have found an orange in your Christmas stocking.• How lucky you were, I think.• It was lucky you were together when you found the bodies. 