Idiom Origins
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The Blue Moon
A blue moon occurs when there's a full moon twice in the same month. This doesn't happen very often, it occurs on average every 2.7 years. Proper etiquette dictated that if you were serving your guest food at the end of the meal, you would give them a slice of cold meat. If you put a little bit of an orange peel around the bottle top, the blue moon is still undrinkable.
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