From Longman Dictionary of Contemporary Englishgo/get/be beyond a jokego/get/be beyond a jokeSERIOUS SITUATIONa situation that has got beyond a joke has become serious and worrying This rain’s getting beyond a joke – let’s go inside. → joke
Examples from the Corpus
go/get/be beyond a joke• The condition of Tam's leather jacket had got beyond a joke. 