drive (one's) pigs to market

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One morning last week Mr. Leung turned to his wife and said, “I believe I heard you driving your pigs to market last night, my dear.” Mrs. Leung was surprised, "Why no, dear, I would never do that. It isn't considered ladylike." If you are wondering what Mr. and Mrs. Leung are talking about, drive (one's) pigs to market means to snore. It's a slang.