Reply To: Replacement idiom for "when the fat lady sings" Home › Forums › Humor & Entertainment › Replacement idiom for "when the fat lady sings" › Reply To: Replacement idiom for "when the fat lady sings" July 27, 2015 9:52 pm at 9:52 pm #1134854 mobicoParticipant It ain’t over ’till Rosh Hashanah.